fox 36 2021 travel change

Fox Float 36 Factory GRIP2 fork review – the benchmark burly trail fork

Is fox’s iconic hard riding trail fork still setting the standard for flat out all-round performance.

Bike Perfect Verdict

Superlative suspension performance and usable adjustability right through the speed and size range, but the Kashima finish makes the Factory version comparatively expensive.

Superb overall spring balance

Plush and sensitive straight away

Consistently supportive

Wider range damping

Happily handles big hits

Performance Elite version is better value

Heavier than before

Bolt-on fender is small

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Fox introduced this, the latest 36, in the 2021 season and it rapidly established itself as the best mountain bike fork for aggressive mid-travel trail riding. A new air-spring and damping range finally caters for lighter or less aggressive riders but still delivers for proper pinners. While this superb fork is top of the range, the Factory version we're looking at here isn’t the most cost-effective model though.

For information on Bike Perfect's testing procedures and how our scoring system works, see our how we test page.

Design and specifications

The latest Fox 36 is a major evolution from previous models inside and out. The most obvious changes structurally are the much bigger, rounded arch with more forward projection. This also gets threaded mounts for a dedicated fender which I’ve not tested but looks a bit small to make much difference in real mud. The back of the fork also features a raised rib that houses a bypass channel from the lowers up to a ‘Bleeder’ air valve on each leg. The crown has more overlap to combat steerer creak and the dropouts now have a floating adjuster to give perfect lower leg alignment. However, while the crown is 20g lighter, overall weight actually increases over the previous incarnation.

The arrival of the bigger Fox 38 model meant the stock travel options for 36 dropped to 160mm in 27.5in and 150 or 160mm travel in 29, but air-springs up to 170mm are available aftermarket. Offset options are 37 or 44mm in 27.5 and 44 or 51mm in 29. Our test fork was a 150mm travel, 44mm offset 29er but we’ve ridden Factory and Performance Elite 36s in other formats too.

Internally, the air-spring and damping have both been reworked too. The new EVOL air spring features a larger negative chamber. The VVC (Variable Valve Control) design with its cunning shim balance point altering, adjustable leaf spring, is now used in the compression damping circuit and not just the high-speed rebound. Low and high-speed compression damping are dialed in via metal wheels on top of the right-hand leg, while high and low-speed rebound damping is under a ‘dustbin’ cover on the right lower. The Factory version gets the iconic ‘Kashima’ gold anodized stanchions that tell everyone you’re riding the top dog Fox. There’s a full pro race ‘Fox orange’ painted lower option for the same price too, but only in 44mm offset and 160mm options.

Performance

Previous generations of Fox have been notorious for stiff feeling forks with a damping range focused on larger and more aggressive riders. The new batch is far more welcoming to lighter, more subtle pilots. As a result, while at 70kg I historically had to wind compression damping completely off, the new 36 gives me at least the lighter end of the high and low-speed damper range to play with. They don’t need an obvious breaking-in period either, with the larger negative spring making them feel super plush off the top of the stroke.

The suggested fork settings are much more accurate than they have been in the past although the default rebound prompts are a bit slow if you’re not regularly doing large jumps. The VVC damping is more forgiving of less than perfect setup in general too and the whole Fox vibe is just a less intimidating and ‘judgy’ place to be.

It’s pretty much a parade of desirable suspension cliches. Buttery smooth off the top and super fast to respond to any jabs or punches from sudden hits at any point of the stroke. Under cornering and braking loads though it stays settled, supportive, and feedback-rich at whatever level your chosen low-speed compression adjustment naturally sits at. It feels super composed through serious slams too, accessing deeper travel progressively without ever wallowing or getting lost mid-stroke. That makes it better able to cope with the seismic appetite of high pivot bikes such as the Forbidden Druid , which I spent a lot of time on with the fork last summer. The only slight niggle is that low and high-speed compression aren’t entirely independent in terms of the overall effect, but you just need to be aware of that and compensate tune accordingly. 

As sublime as the Float Factory 36 is, it’s worth noting that you get exactly the same changes and performance with the Fox Performance Elite version for $150/£100 less just without the golden Kashima stanchion coating. Given that I’ve never seen any tangible benefits from Kashima in terms of less friction or greater longevity  The FIT4 damper version with a three-position firm lever for extra climbing support is also cheaper at $1,079/£1179. The current RockShox Lyrik is both 100g lighter and more than a couple of hundred dollars/pounds less too.

Fox's Float Factory 36 is a fantastic fork and it really does set the gold standard for hardcore trail suspension. It’s supple, subtle, and far more welcoming and less tiring than previous generations for lighter riders, but it’ll match the best rear suspension bikes without worry.

The Performance Elite delivers the same performance for less money though and while the current RockShox Lyrik is lighter and cheaper but not quite as plush. We’ll be re-evaluating that comparison as soon as we can.

Tech Specs: Fox Float 36 Factory GRIP2

• Price:  $1441.99 / £1239.99
• Sizes: 27.5 and 29in, 150 or 160mm travel, 37 - 51mm offset
• Weight:  1191g (model tested – 150mm travel 44mm offset 29er cut down to 185cm steerer)

Guy Kesteven has been working on Bike Perfect since its launch in 2019. He started writing and testing for bike mags in 1996. Since then he’s written several million words about several thousand test bikes and a ridiculous amount of riding gear. He’s also penned a handful of bike-related books and he reviews MTBs over on YouTube.

Current rides: Cervelo ZFS-5, Specialized Chisel, custom Nicolai enduro tandem, Landescape/Swallow custom gravel tandem

Height: 180cm

Weight: 69kg

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How to Change the Travel in a Fox 36

As someone had pointed out, the Yeti SB150 that I presented to a few weeks ago, which I am using for product reviews, was fitted with a Fox 36 fork with “only” 160mm of travel. For this bike Yeti in fact suggests a 170mm fork, so that the so-called vertical travel matches the 150mm of rear travel. The subject was discussed with the engineers of the American brand during the launch of the Yeti SB165 .

I reached out to Fox to ask about taking the 36 Grip2 from 160 to 170mm. Receiving a positive response, I was also told that I could do it myself, and that they would send me the necessary parts kit. ” It’s quite simple, just follow the instructions in the video you’ll find on our site .” And so, I took a look on Ridefox.com and I found everything , even which forks can be modified in their travel and how many volume spacers to insert to have the same feeling as when the fork had 160mm of travel.

The video is very well done and our workshop is equipped with every necessary tool so, after a brief bit of research, I got to work!

You start by removing the fork from the bike and removing all the air from the positive chamber. Then, clamp it in the stand in a horizontal position (so as not to spill the oil when you remove the lowers), then unscrew the rebound knob and the bolts that hold the lower leg assembly in place.

It’s necessary to use a mallet to get the air spring and damper rods to unseat from the lower leg assembly, and there is a special fitting to make the removal easier, which we do not have. I therefore used a small socket bit whose edge is smaller than the threaded part you see below and I tapped with caution.

Next, pour the oil from the lowers into a special container, and then pour it into a bottle that will eventually go to the landfill.

The time has therefore come to dismantle the left side air spring assembly.

To do this I first have to remove the valve cap at the fork crown and REMOVE ALL OF THE AIR from the positive spring. Then, using the appropriate socket, you can remove the valve cap assembly which the volume reducers attach to.

Then I remove the locking ring at the bottom of the stanchion. A thin flat head screwdriver should do the trick.

Now I can take out the piston that I’m going to replace.

Here they are side by side below: the new 170mm one, not yet greased, and the old 160mm one. The difference between the two is only in length. Notice how the well lubricated and clean it is, despite 8 months of use.

Now it’s time to put fresh oil in the lower leg assembly, starting with a small amount placed above the piston. It only needs 3cc. – t he oil, specifically is Fox’s 20WT Gold, which  is very dense.

At this point, I closed the left top cap, removing the volume spacer. In fact Fox suggests starting out with the new 170mm travel without a spacer, as you can see in the table below. I put the air in the chamber: 70 psi, to start, then I’ll do the fine tuning when I put the fork on the bike.

Time to reinstall the lower leg assembly. It’s an o peration that requires a bit of extra patience – to align stanchions with the dust wipers properly, and then push them up.

Again with 20WT Gold oil insert 10cc in the air side (the one I just changed). Instead, on the right side, where the sealed cartridge is, put 40cc of the 5WT oil .

Then tighten the bolts that hold the lowers with a torque wrench to their respective specs (5Nm on the right and 9Nm on the left).

The end! All that remains is to reinstall the fork on the bike and then it’s ready to ride.

In addition to increasing the travel of a 36, ​​it can also be decreased . The operation that I’ve just shown becomes relevant if one decides to change out a frame of a bike, while keeping the components and the situation therefore requires a change in front travel.

The piston kit must be ordered directly from Fox via a dealer.

Ridefox.com

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Russia has launched several air attacks on Ukraine this week, costing Moscow a reported £1.1bn. Last night, Kyiv came under drone attack for the third night in four days, with debris injuring people and damaging buildings.

Thursday 29 August 2024 13:55, UK

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Ukraine is calling on the civilian population in its eastern city of Pokrovsk to evacuate as Russian troops draw closer to its outskirts.

Readers have been sending in their questions to our senior correspondents and military experts for their take on what could happen next.

Today, Malcolm asks:

How serious is the situation in Pokrovsk? If the city falls to Russian forces, what are the strategic consequences for Ukraine?

Military analyst Sean Bell says...

It is very difficult to provide clarity over the tactical progress of the war given the relative paucity of detailed information about progress, challenges and opportunities.  

However, it appears likely that Vladimir Putin's near-term objective of his "special military operation" is to secure Crimea, the Donbas and the land bridge between the two areas.  

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Pokrovsk is a strategically important logistics and transport hub for Ukrainian forces in the region, and Russian forces are now reported to be only six miles away from the town, leading the Ukrainians to evacuate the civilian population.

The Russian president knows that it is very difficult to maintain momentum during the winter months, so he has perhaps 10 to 12 weeks available to achieve his objectives before the winter weather settles in.   

If Russian forces can seize Pokrovsk before the winter, it is possible that Mr Putin will indicate he is ready to negotiate an end to the conflict.  

Depending on the outcome of the forthcoming US presidential elections, that raises the prospect of Mr Putin being rewarded for his brutal invasion of Ukraine, which would have profound implications for global security.

Ukraine's invasion of Russia's Kursk region will soon enter its fourth week, with around 500 square miles of territory captured so far, according to the head of Kyiv's military.

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Here, we look at some key images from the start of the invasion into Kursk.

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"And we will not forgive Russia for a single destroyed Ukrainian life."

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As a result of the attack, three out of four power units of the Rivne nuclear power plant were disconnected from the grid, it said.

Another nuclear power plant, the South Ukrainian, was also forced to decrease its output "due to fluctuations in the national power grid".

A fighter jet from Belarus attempted to shoot down a Russian drone that flew into the country's airspace this morning, a monitoring group has said.

The Belarusian Hajun group said this is "probably the first recorded case of a Belarusian Air Force fighter attempting to destroy a military target in the sky".

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The drone was said to be a Shahed, also known as a "kamikaze drone".

Sky News has not independently verified these claims.

For context: Belarus and Russia share a land border and the two are considered close allies.

When Russia launched its full-scale invasion of Ukraine in 2022, Belarus allowed Moscow to stage part of the invasion from its territory.

In the wake of Ukraine's advances into the Russian region of Kursk this month, Belarusian President Alexander Lukashenko he had stationed nearly a third of the country's armed forces along its Ukrainian border.

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Volodymyr Zelenskyy has repeatedly asked Western leaders to let Ukraine use long-range weapons on Russian territory.

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This week, Sir Keir Starmer said there had been "no new decisions" on the matter, with German Chancellor Olaf Scholz saying the same yesterday in Berlin.

Speaking on Sky News this morning, Ukrainian MP Kira Rudik said the situation across the country remains difficult and urged Kyiv's allies to speed up their decision-making process.

She said: "It seems for us that the only way to defend our people and defend our territories is to be able to hit Russian missiles and Russian planes at the start of their launches, not when they are approaching our energy infrastructure or our homes. 

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Russia is continuing its advances in the Donbas region as it seeks to capture the key city of Pokrovsk.

Civilians are being evacuated from the city, with Volodymyr Zelenskyy warning the situation is "difficult".

The map below shows Russia's gains on Ukrainian territory.

On the eastern front, Ukraine's invasion of Russia's Kursk region is ongoing.

There have been Russian reports this week that Ukraine has attempted to break into the neighbouring Belgorod region, with Moscow's defence ministry saying the situation "remains difficult but under control".

The map below shows Ukraine's gains on Russian territory since its invasion of the border region began on 6 August.

 A lioness with shell shock rescued from Ukraine has taken her first steps outside at a sanctuary in Kent.

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She's now beginning to get used to her new life in the UK, feeling grass underneath her paws for the first time after spending much of her life confined to a small space on a concrete floor.

The sanctuary said before Russia's invasion of Ukraine, she had been kept at a private home and was found malnourished and with severe concussion.

Read more here ...

Russia's attacks on Ukraine's energy infrastructure is taking the country "closer and closer" to a total blackout, says one of its MPs.

Since the start of the full-scale invasion, Russia has caused £13.5bn of damage to Ukraine's energy infrastructure, the Kyiv School of Economics Institute estimates.

Speaking on Sky News, Kira Rudik, who lives in Kyiv, says the city's homes do not have electricity for the "majority of the day".

"Even right now, I'm speaking to you all being on a diesel generator," she said.

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"How we are going to survive the winter is unclear right now, because the weather outside is still good. But once it gets colder and people start to consume more energy, we will not be able to handle it."

Volodymyr Zelenskyy said in June that Russia had destroyed 80% of Ukraine's thermal energy generation and a third of its hydro generation.

But this week, he declined to elaborate on what further damage Monday's strikes had caused.

"I don't really like energy PR," he said. "It's not very helpful when the enemy knows what damage they have done. 

"Let the information about the condition of our energy facilities and what we are currently doing there be kept quiet."

The Polish prime minister, Donald Tusk, says Warsaw's allies have recommended it shows restraint over shooting down unidentified targets in its airspace.

Poland said a drone had likely entered its airspace early on Monday morning during a Russian bombardment of Ukraine, with the object said to have flown 15 miles (25km) into Polish territory, after which it disappeared from radar.

Mr Tusk was asked yesterday about the incident but said it was difficult to identify objects in real time.

"The problem with shooting down is often of a different nature," he explained.

"It is often a fraction of a second, which makes it impossible to check whether it is not a civilian object, whether it is not a stray plane."

He added that Poland's allies had recommended some restraint over the matter and said he appreciated his country's military for their "reasonable, balanced position".

"They are not interested in opening fire every time something moves in the sky," he said.

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I can't get full travel on my 2021 Fox 36 grip2

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I've done some tuning with my new Fox 36 but can't seem to get it right. My Fork is 150mm, code D46B and came on a 2020 Fezzari Delano Peak Part number: 910-25-595 Short ID: D46B Description: 2021, 36, A, FLOAT, 29in, P-SE, 150, Grip 2, HSC, LSC, HSR, LSR, Shiny Blk, Std/Gloss Blk Logo, 15QRx110, 1.5 T, 44mm Rake, OE I weigh*190lbs with gear. I've ridden this several times now on steep, rough, fast trails with small drops which is where I expect to get full or nearly full travel, but I max out at 135mm of travel - often as little as 127mm. I've run as little as 75psi which is 27% sage (likely too much sag), removed both of the volume spacers and have the following settings. LSC: openHSC: openLSR: 6HSR: 3 I've tried using some compression but it just felt more harsh on small bumps and I used even less travel. I've read on this forum and others that this fork often comes with too much grease in the negative chamber*and I was going to check that. Is there anything else I should look at or try?  

Set up your suspension to feel good, not to use all the travel. It's possible you just don't need a 150mm fork.  

This. Go one further and cut the travel o-ring off. Do it feel good (yes or no) if no what's it doing how do I remedy this make the change return to question 1.  

Tough to tell. I would do a lower leg and air spring service on it to make sure that it's lubricated and working properly. It's good that you're checking sag, make sure you have the right sag in back as riding too far off the back of the bike will change weight distribution and change the dynamic ride height of the suspension. Other then that... you didn't state if your were counting your settings from open or closed. If it's closed then you are running way, way, way too much rebound damping. You should be running in the ball park of -5 to -6 on both HSR and LSR at around 75-77psi. At your weight, I would expect you to be running around 80psi with no volume reducers or 77ish with 1.  

minimusprime said: Tough to tell. I would do a lower leg and air spring service on it to make sure that it's lubricated and working properly. It's good that you're checking sag, make sure you have the right sag in back as riding too far off the back of the bike will change weight distribution and change the dynamic ride height of the suspension. Other then that... you didn't state if your were counting your settings from open or closed. If it's closed then you are running way, way, way too much rebound damping. You should be running in the ball park of -5 to -6 on both HSR and LSR at around 75-77psi. At your weight, I would expect you to be running around 80psi with no volume reducers or 77ish with 1. Click to expand...

I wouldn't be too concerned about not getting full travel on those trails. I've ridden Predator, OTG, Fully Rigid, and Joy Ride. Definitely a great test of your suspension's ability to remain composed and keep wheels in touch with the ground as well as keeping you from feeling hammered to pieces. As long as it's doing that, you should be good to go. A better full-travel test would probably be at Duthie. Try sending a jump there way out to flat or hitting a big drop. Or case one of the gaps on Gravy Train (kidding).  

With modern forks that have large negative springs I don't think dropping pressure is a particularly effective way to get good response on small bumps as there's already little to no spring preload. You're probably going to get better results from addressing friction (bushing tightness? decent bath oil?) and damper pre-load.  

I don't know how to check bushing tightness (sliding the lowers on during a rebuild I assume) and I definitely don't know about damper preload. Does that have to do with how HSC is adjusted? Thanks for the suggestions.  

To know what the problem is requires an approach that covers everything. Friction, spring-rate, progression, damping etc. Fox over recent years have made fork bushings tighter to get better stiffness numbers but this means they don't slide as well as they can. So that's not helping. Often factory assembly hasn't got the lube in all the right places and can have too much lube in the wrong places. I haven't ridden the 2021 Grip2, but the 2018-20 Grip2 was overdamped for most riders. Which doesn't help either. Here's a setup guide to work through: https://www.shockcraft.co.nz/catalog/category/view/id/1201 Ignore sag. It's a useless metric as bike geometry and rider position when attempting to measure vary too much. Regarding using full travel. You don't have to use it all the time, but if you never get there it's a sign that either something is wrong or the setup doesn't match how you're using it. You're missing out on both mid-stroke and end-stroke. I don't subscribe to the idea that a 85kg male shouldn't be able to get full travel sometimes. For a 55kg female it's a different story.  

Thanks for the ideas and different approach to tuning.  

Bottom out\using full travel on every ride is not important as long as the fork feel and work as you like. Service can always help, but i think your settings are a bit off... i would start over around 20% sag, no volume spacers, and use Fox recommended settings for your weight as starting point, and adjust from here.  

I’m surprised that nobody has mentioned this but too much LSR will make a fork feel harsh. This is common with Fox forks. On my 2020 Fox 36, I could not get the rebound to feel proper without making the compression harsh. Try opening up the LSR and you’ll feel the change in the compression circuit. I could have gone for a revalve but decided to try a Lyrik Ultimate and have been very happy with the better oil flow.  

bog said: I'm surprised that nobody has mentioned this but too much LSR will make a fork feel harsh. This is common with Fox forks. On my 2020 Fox 36, I could not get the rebound to feel proper without making the compression harsh. Try opening up the LSR and you'll feel the change in the compression circuit. I could have gone for a revalve but decided to try a Lyrik Ultimate and have been very happy with the better oil flow. Click to expand...

If LSR makes fork harsh that could be too restricted midvalve flow. Dougal, any chance for more info if you just pull shims, increase flow or use softer spring?  

I wrote to Fox asking about this problem, and they told me the procedure to equalize the negative air chamber when airing up the fork after taking the volume spacers out. I hadn't done that properly, and I can now get full travel on a simple parking-lot drop-to-flat test which I could not before! I still plan to service the lowers to make sure the amount of grease and fluids is correct. You will want to attach your pump to the schrader valve under the blue air cap on the top of the left side crown. Using the air release feature on your pump ( usually a little button near the head of the pump). Release all of the pressure from your fork through the air valve on the pump. Hold the front wheel on the ground and grab the handle bars and pull them up, trying to extend fork. Now pump air into the fork to about 30 psi. Once completed, leave the pump attached to the fork and compress it very slowly for 5-6 times. You should feel the fork equalize and you should get full travel after you repeat this process two more times.  

I can get full travel but my fork still doesn't work well The above procedure to equalize the negative air spring pressure worked in that I can now reliably get full travel (assuming pressure and volume spacers are low enough) but the fork is still not performing very well. I think I'm going to send it in to be warrantied - I'd be curious to hear if anyone else has encountered a problem like this. This fork is extremely harsh on small bumps, with poor traction on loose terrain. It takes a lot of force to move the fork from a static position. It feels like the bushings are extremely tight - adding a lot of friction - or else something else is causing a large amount of stiction. I've tried every combination of pressure, damping adjustment and volume spacers that I can think of, but this problem is always present. I can even bottom out the fork - it's not that I'm using too much pressure, compression damping or volume spacers - it's just very stiff-feeling and uncomfortable on impacts. It feels this way even with HSC and LSC fully open (no compression damping) and adding any compression damping makes it feel even more harsh. I went as far as performing a lower leg service to ensure that the right amount of grease and oil was in the fork (there was) but the performance was the same after. While performing that service, I did notice that the lowers were difficult to slide onto the stanchions, and even with lowers just sliding freely on the stanchions (without the spring or damper attached) it takes quite a bit of force to slide the lowers up and down on the bushings. I don't know if this is normal, but it seems like it could be the source of friction. I've followed the instructions to adjust the floating axle, and no amount of adjustment there seems to make the fork easier to compress or break through the initial stiction. Just when I thought I might be going crazy, I traded bikes with a friend who has a 2020 150mm Fox 36 Grip2, and his fork moves very freely on small bumps and does not have this stiction problem at all! It feels completely different, and performs much better. We are similar in weight, and he agreed that my fork felt weird and much different from his. We also noticed that when spinning up a fire road, his fork will move a little bit when it rolls over small rocks and ruts while mine it completely static unless I hit something larger with more force while going downhill.  

dromond said: I'd be curious to hear if anyone else has encountered a problem like this. This fork is extremely harsh on small bumps, with poor traction on loose terrain. It takes a lot of force to move the fork from a static position. It feels like the bushings are extremely tight - adding a lot of friction - or else something else is causing a large amount of stiction. I've tried every combination of pressure, damping adjustment and volume spacers that I can think of, but this problem is always present. I can even bottom out the fork - it's not that I'm using too much pressure, compression damping or volume spacers - it's just very stiff-feeling and uncomfortable on impacts. It feels this way even with HSC and LSC fully open (no compression damping) and adding any compression damping makes it feel even more harsh. I went as far as performing a lower leg service to ensure that the right amount of grease and oil was in the fork (there was) but the performance was the same after. Click to expand...

Sounds like tight bushings. Have you looked at the Tight Bushings thread on here.  

Following up for anyone that encounters this issue: It takes a lot of force to move the fork from a static position. It feels like the bushings are extremely tight - adding a lot of friction - or else something else is causing a large amount of stiction. I sent my fork into Fox warranty and got it back 12 days later. There was no included description of the work, but the stiction is gone. The bike now sags under its own weight, and it is much more supple. I can now easily bottom at 75psi with one volume spacer which is much more like what I expected in the first place so I need either two spacers or more pressure. The fork just feels and rides much better. I assume that they either replaced the too-tight bushings or enlarged them. In summary: if your new fork feels really bad despite trying all available tuning options, something may be wrong with it. Send it in to get fixed.  

My girlfriends 36 is feeling a bit firm and she cant get full travel with 0 spacers installed. 65 psi 30% sag, HSC open LSC 2 clicks of damping LSR 4 from fully closed, HSR 4 from fully closed. Has anyone opened the damper and changed/removed shims from the piston to get a bit less HSC? I opened the air spring and cleaned all the grease off.That helped a ton but the fork is still a bit firm. I am not surprised since I am hearing the Grip 2 is over damped and she is only 130 lbs.  

There is no way she's getting 30% sag with 65psi. Air pressure is your main problem.  

Have you tried checking for stiction of the type that I first experienced? Does the bike sag at all under its own weight at all? Is it sensitive to very small downward pressure on the bars? When I had bad stiction, it basically felt really bad/high amounts of low speed compression damping.  

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US faces 'inevitable' ISIS attacks at home following Moscow massacre: retired general

Retired gen. frank mckenzie said he believes 'the threat is growing' after the u.s. withdrawal from afghanistan.

11 detained in connection with deadly mass shooting in Moscow: Putin

Fox News’ Madison Scarpino reports on the latest in the aftermath of a deadly shooting in Moscow.

The former head of U.S. Central Command warned Sunday that the Islamic terror group ISIS has a "strong desire" to attack the U.S. and other foreign powers, a threat he suspects is growing.

Retired Gen. Frank McKenzie told ABC News' "This Week" that U.S. officials should "believe them when they say that."

"I think the threat is growing," McKenzie said, noting threats from ISIS-K after the group took responsibility for a deadly attack in Moscow, Russia , last month that killed more than 140 people. The terror group also claimed responsibility for a mass bombing in Iran in January.

"It began to grow as soon as we left Afghanistan, it took pressure off ISIS-K," McKenzie said, referring to the chaotic U.S. withdrawal from the country in 2021. "So I think we should expect further attempts of this nature against the United States as well as our partners and other nations abroad. I think this is inevitable."

POLISH LEADER WARNS OF 'PREWAR ERA,'URGES EUROPEAN NATIONS TO INVEST IN DEFENSE

Then-Gen. Kenneth McKenzie listens during a Senate Armed Services Committee hearing on the conclusion of military operations in Afghanistan and plans for future counterterrorism operations, Tuesday, Sept. 28, 2021. (Sarahbeth Maney/The New York Times via AP, Pool)

McKenzie, who commanded U.S. forces in the Middle East, including the withdrawal from Afghanistan, said the U.S. holds a large enough military presence in Iraq and Syria to combat extremists in the region.

The retired general maintains that the U.S. should have kept a small troop presence in Afghanistan amid the exit instead of completely pulling out and ending the longest war in U.S. history.

President Biden previously claimed there would be an "over-the-horizon capability" to "act quickly and decisively" in Afghanistan, even with troops no longer stationed in the region.

McKenzie said the U.S. now has "almost no ability to see into that country and almost no ability to strike into that country," which he says benefits ISIS and other terror groups .

"If you can keep pressure on them ... in their homeland and their base, it makes it hard for them to conduct these types of attacks," he said. "Unfortunately, we no longer place that pressure on them, so they're free to gain strength, they're free to plan, they're free to coordinate."

McKenzie said he believes "things would be different" and "we might actually be safer than we are" if the U.S. and its allies kept a small presence in Afghanistan, prolonging military involvement in the region.

The deadly attack in Moscow on March 22 highlights the threat of terror groups being able to regroup and plan large-scale operations, McKenzie said.

Despite the dangers, these efforts by the terror groups are more easily detectable, McKenzie said. The U.S. said it alerted the Kremlin to a possible terror plot weeks before that attack happened.

SWEDEN'S DEFENSE MINISTRY WARNING TO BRACE FOR 'WAR' SENDS PUBLIC INTO PANIC

Retired Gen. Kenneth McKenzie warned that ISIS has a "strong desire" to attack the U.S. and other foreign powers. (Rod Lamkey/Pool via AP)

"I think there was probably good opportunity for the Russians to have averted this attack had they actually listened to the material that was presented to them," McKenzie said.

The suspects in the Moscow attack opened fire in one of the largest shopping and entertainment complexes in Russia before a fire broke out in the complex, according to the Russian Foreign Security Service.

A U.S. counter-terrorism official told the New York Post that ISIS-K terrorists could cross through the U.S. borders and carry out an attack similar to the one in Moscow. The official said ISIS is growing "bolder" and that its members may attempt to take advantage of the chaos at the southern border and seek out a "bigger" target.

"An attack on US soil is definitely a possibility," the official said. "It would certainly send a message."

McKenzie's comments on Sunday also come after European leaders warned about the prospect of war.

Polish Prime Minister Donald Tusk called on European nations to step up investment in their defense, arguing that the continent is not ready for the current "prewar era."

Retired Gen. Frank McKenzie warned of the Islamic State terror group's "inevitable" threat to the U.S. and other foreign powers after the deadly attack in Russia last month. (AP Photos/Lolita Baldor, File)

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"I don't want to scare anyone, but war is no longer a concept from the past," he said in a recent interview with European newspapers before pointing to Russia's invasion of Ukraine. "It’s real, and it started over two years ago."

And in January, Swedish defense officials warned about potential war as the nation was close to joining NATO, which has officially happened.

"For a nation for whom peace has been a pleasant companion for almost 210 years, the idea that it is an immovable constant is conveniently close at hand," Swedish Civil Defense Minister Carl-Oskar Bohlin said at the time at Folk och Försvars, or "Society and Defense," annual national conference in Sälen.

"But taking comfort in this conclusion has become more dangerous than it has been for a very long time," he said. "Many have said it before me, but let me do so in an official capacity, more plainly and with naked clarity: There could be war in Sweden."

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