MTB Tech Rumors and Innovation

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5/18/2025 8:18pm
UfuS78 wrote:
Few details about new Fox USD fork

Few details about new Fox USD fork


IMG 5530IMG 5558

Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. Does this mean the inverted 40...

Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. 

Does this mean the inverted 40 will get another shot?

roost66 wrote:
From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has...

From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has some serious upsides for stiffness etc. But most will need a new hub, which is like $100-200 + spokes and labor.  Worse if you have multiple bikes because they may no longer be swap able between bikes.  

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major difference in twisting feel when the weight was loaded. Upside down fork the 20mm will prob be a big jump in the right direction.

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5/18/2025 9:10pm

I don't know.. Many previous USD forks were 20mm axles.. I'm curious if the potentially bigger chassis has more of effect on things than the axle.. As I understand it, most of the flex people feel when they put the front wheel between their legs and twist is happening where the stanchions enter the uppers and not so much at the axle.. 

1
sethimus
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5/18/2025 9:32pm Edited Date/Time 5/18/2025 9:33pm
Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. Does this mean the inverted 40...

Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. 

Does this mean the inverted 40 will get another shot?

roost66 wrote:
From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has...

From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has some serious upsides for stiffness etc. But most will need a new hub, which is like $100-200 + spokes and labor.  Worse if you have multiple bikes because they may no longer be swap able between bikes.  

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major...

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major difference in twisting feel when the weight was loaded. Upside down fork the 20mm will prob be a big jump in the right direction.

not according to intend, they had it first and found no difference, getting the upper chassis right is more important

6
Slavid666
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5/18/2025 10:43pm
I don't know.. Many previous USD forks were 20mm axles.. I'm curious if the potentially bigger chassis has more of effect on things than the axle...

I don't know.. Many previous USD forks were 20mm axles.. I'm curious if the potentially bigger chassis has more of effect on things than the axle.. As I understand it, most of the flex people feel when they put the front wheel between their legs and twist is happening where the stanchions enter the uppers and not so much at the axle.. 

The shiver SC that I had on my Giant AC1 back in the day was a noodle. This was back when I probably weighed 135lbs, no axle was going to fix that wobbly fork. I loved it, but it didn’t change the fact that that it was flexy AF. I agree that to make a solid USD fork it’s a package deal. Putting a 20mm axle is just another bandaid. My 2 cents…

1
2
Primoz
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5/18/2025 10:57pm Edited Date/Time 5/18/2025 10:58pm
Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. Does this mean the inverted 40...

Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. 

Does this mean the inverted 40 will get another shot?

roost66 wrote:
From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has...

From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has some serious upsides for stiffness etc. But most will need a new hub, which is like $100-200 + spokes and labor.  Worse if you have multiple bikes because they may no longer be swap able between bikes.  

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major...

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major difference in twisting feel when the weight was loaded. Upside down fork the 20mm will prob be a big jump in the right direction.

How was the conversion handled? Could the adapters have some slack in how they interfaced with the lowers and the axle thus severely lowering the apparent stiffness?

It's not just the diameter of the axle that is at play here. It's the thickness of it and how you anchor it in the lowers that also plays a big role. 

3
Jakub_G
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5/18/2025 10:58pm
From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major...

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major difference in twisting feel when the weight was loaded. Upside down fork the 20mm will prob be a big jump in the right direction.

And yet at the rear where most of the rider weight is and where most of the heavy hits are taken we comfortably run 12mm hollow axles at lengths that are 30% higher. Weird.

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3
Primoz
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5/18/2025 11:05pm

But you also have a triangle connecting the rear wheel to the front or at least a single piece box section, not a bushinged tube in tube arrangement where the two tubes can rotate one relative to the other. These details do wonders for stiffness. QED, 20 years ago it was completely normal to run a 20 mm axle in the front and a QR in the back. 

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DylanJM
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5/19/2025 12:32am

Gotta agree... It's got a serial number and it's in the system.. Seems likely that production is underway and will be released sooner than later..

It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. 

I have to say I find it an odd choice from Fox to go the usd route. I feel this will most likely be a limited qty thing rather than full blown offering to replace the 38.

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5/19/2025 2:47am
Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. Does this mean the inverted 40...

Will Fox stop saying it's just a prototype now? Excellent choice going with a 20mm axle for the single crown version. 

Does this mean the inverted 40 will get another shot?

roost66 wrote:
From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has...

From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has some serious upsides for stiffness etc. But most will need a new hub, which is like $100-200 + spokes and labor.  Worse if you have multiple bikes because they may no longer be swap able between bikes.  

Hope front hubs for life and luckily the list of 148 DH bikes is growing day by day. (Canyon, YT, Transition, GT, Forbidden, Spesh, Frameworks) Glad...

Hope front hubs for life and luckily the list of 148 DH bikes is growing day by day. (Canyon, YT, Transition, GT, Forbidden, Spesh, Frameworks) Glad the industry is having to cave a little on these incremental improvements that could end up robbing you of a day of riding if you don’t have backup parts. Very interested to see if the new Demo is still 148.

I reckon the new demo is gonna solve the 148 issue by using a 148 super-wide hub like the session is doing. In my eyes this is exactly what specialized is up to rn. Only applies to the r2r builds they are going to release obviously.

krabo83
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5/19/2025 4:39am

Gotta agree... It's got a serial number and it's in the system.. Seems likely that production is underway and will be released sooner than later..

DylanJM wrote:
It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. I have to...

It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. 

I have to say I find it an odd choice from Fox to go the usd route. I feel this will most likely be a limited qty thing rather than full blown offering to replace the 38.

i‘m 99,9% confident that the podium USD fork won‘t replace the 38 and will just run besides it, probably even limited.

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Jakub_G
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5/19/2025 5:33am
Primoz wrote:
But you also have a triangle connecting the rear wheel to the front or at least a single piece box section, not a bushinged tube in...

But you also have a triangle connecting the rear wheel to the front or at least a single piece box section, not a bushinged tube in tube arrangement where the two tubes can rotate one relative to the other. These details do wonders for stiffness. QED, 20 years ago it was completely normal to run a 20 mm axle in the front and a QR in the back. 

Awesome you brought the qr in to equation, old qts had a higher clamping force than thru axles we run these days, essentially making dropouts and steel axle one piece even though they were much smaller diameter (9mm at 100mm width vs 15mm at 110mm) I would guess they weren't much less stiff. One popular bike channel compared the two few years ago, don't remember his name but he was engineer and I think he worked with hambini on some videos.

3
Primoz
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5/19/2025 5:44am Edited Date/Time 5/19/2025 5:50am

Peak torque tested the clamping force of QR skewers and compared that to the current crop of bolt-on axles. 

A few problems.

One, a QR has an open dropout which means the axle is not fully enclosed plus it barely even fits into the frame length wise. A through axle these days has 10+ mm of axle interfacing the frame (even more for a fork) length wise, which means the axle can't rotate around the dropout (like the QR essentially could), it has to be bent if the dropout sides go out of alignment. This gives a lot more stiffness connecting the two sides.

Two, peak torque did not test QR through axles (Maxle) and their axial clamping forces (even though I asked him to do it...). Might be that it's higher in that case. The QR skewer is only 5 mm thick which makes it somewhat elastic, even if it's aluminium the cross section of the average 12 or 15 mm through axle is quite possibly bigger enough to offset lower stiffness of aluminium in general to make the axle, essentially, a stiffer spring. If you preload it by the same amount with the came (give it the same stretch), the clamping force will be the same. And I would not be surprised if the clamping force of a QR Maxle is higher than a bolt on Maxle (even more so when you bolt the axle with a multitool because that's what you have at the side of the trail).

FWIW, I think it's advised not to use QR axles in UDH hangers/Transmission derailleurs. A higher clamping force causing issues with the nut thread (either hanger or derailleur) is the first thing that comes to mind (though the fine thread pitch used with UDH is stronger than a coarser thread and it's usually the bolt that's stripped before the nut is). I run Maxle QRs front and back regardless. 

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5/19/2025 7:38am
roost66 wrote:
From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has...

From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has some serious upsides for stiffness etc. But most will need a new hub, which is like $100-200 + spokes and labor.  Worse if you have multiple bikes because they may no longer be swap able between bikes.  

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major...

From a stiffness standpoint 20mm is the way to go. I tested a 2024(38mm) Boxxer that was converted to 15mm axle and it was a major difference in twisting feel when the weight was loaded. Upside down fork the 20mm will prob be a big jump in the right direction.

Primoz wrote:
How was the conversion handled? Could the adapters have some slack in how they interfaced with the lowers and the axle thus severely lowering the apparent...

How was the conversion handled? Could the adapters have some slack in how they interfaced with the lowers and the axle thus severely lowering the apparent stiffness?

It's not just the diameter of the axle that is at play here. It's the thickness of it and how you anchor it in the lowers that also plays a big role. 

Yes many factors with axle thickness can play a roll. The clamps make a giant change as well. The dorado going from 1 bolt upper to 2 bolt upper added a lot of torsional rigidity.

IMG 6707.jpeg?VersionId=RGetYimUZ KtVppBk7aklcBHpl.0IMG 6708
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Zuestman
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5/19/2025 7:54am
roost66 wrote:
From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has...

From a buyers perspective, 20mm axle sucks, as DH bikes seem to be fading, and the popularity of DH hubs with it.  I’m assuming it has some serious upsides for stiffness etc. But most will need a new hub, which is like $100-200 + spokes and labor.  Worse if you have multiple bikes because they may no longer be swap able between bikes.  

Quoting Roost here to keep it in line, but not calling you out specifically because so much talk on DH hubs.

Here is the thing... any rider purchasing this fork (by itself or on a bike) will be running hubs that can do both 15 and 20mm boost spacing.  This isnt a new thing to have a convertibale hoba and most (couple small outliers) 15mm x110 boost hubs can convert to 20 mm with an endcap swap.  This isn't a major chang in anyones hub and usually shouldnt require a relace or anything like that.

Fox didnt go with some proprietary unknown standard. They took on eof the most common standards in the industry for this... suprised that this is such an "issue" for so many.  This is a completely normal hub that most of us tech nerds in here have a compatible hub for.

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1
5/19/2025 8:14am
Zuestman wrote:
Quoting Roost here to keep it in line, but not calling you out specifically because so much talk on DH hubs.Here is the thing... any rider...

Quoting Roost here to keep it in line, but not calling you out specifically because so much talk on DH hubs.

Here is the thing... any rider purchasing this fork (by itself or on a bike) will be running hubs that can do both 15 and 20mm boost spacing.  This isnt a new thing to have a convertibale hoba and most (couple small outliers) 15mm x110 boost hubs can convert to 20 mm with an endcap swap.  This isn't a major chang in anyones hub and usually shouldnt require a relace or anything like that.

Fox didnt go with some proprietary unknown standard. They took on eof the most common standards in the industry for this... suprised that this is such an "issue" for so many.  This is a completely normal hub that most of us tech nerds in here have a compatible hub for.

yes if you go from a 20mm hubs all of them can go down to 15mm with different end cap. But quite a few native 15mm front hub are not able to to go up to 20mm because they use smaller bearing either 17 or 18mm ID bearing like the recent One Up hubset.

5
Cougar797
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5/19/2025 8:17am

Gotta agree... It's got a serial number and it's in the system.. Seems likely that production is underway and will be released sooner than later..

DylanJM wrote:
It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. I have to...

It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. 

I have to say I find it an odd choice from Fox to go the usd route. I feel this will most likely be a limited qty thing rather than full blown offering to replace the 38.

krabo83 wrote:

i‘m 99,9% confident that the podium USD fork won‘t replace the 38 and will just run besides it, probably even limited.

I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would anyone want a 170mm plus 38 IF (and big if) this usd fork can be had for the same price as the current 38. The dual chamber air spring honestly is probably as big of an update as the chassis too. I bet that will find its way to the 38 regardless. 

Hub wise, like zuestman said above I have no serious concern that the 20mm axle bit will hurt its acceptance at all. Most hubs are convertible and honestly I'd rather have to adapt down to a 15mm axle on a 20mm hub then vise versa. 

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1
seanfisseli
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5/19/2025 8:47am
DylanJM wrote:
It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. I have to...

It still says prototype on the Fox page. I imagine everything gets a serial and data page whether it gets to production or not. 

I have to say I find it an odd choice from Fox to go the usd route. I feel this will most likely be a limited qty thing rather than full blown offering to replace the 38.

krabo83 wrote:

i‘m 99,9% confident that the podium USD fork won‘t replace the 38 and will just run besides it, probably even limited.

Cougar797 wrote:
I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would...

I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would anyone want a 170mm plus 38 IF (and big if) this usd fork can be had for the same price as the current 38. The dual chamber air spring honestly is probably as big of an update as the chassis too. I bet that will find its way to the 38 regardless. 

Hub wise, like zuestman said above I have no serious concern that the 20mm axle bit will hurt its acceptance at all. Most hubs are convertible and honestly I'd rather have to adapt down to a 15mm axle on a 20mm hub then vise versa. 

Fox knows that if you really want an USD fork you will deal with the hub issue one way or another. Can’t imagine an actual Fox USD fork customer saying “oh no nevermind I am obsessed with my current front hub and I am also too poor for a wheel build Sad

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5/19/2025 8:57am

Maybe we need the Foes hub again... Didn't that thing use a 30mm axle?

4
5/19/2025 9:38am

Not sure if the lower shock mount is replaceable for adjustment or if it has movement during travel?

IMG 6709.jpeg?VersionId=t4T
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notthatbryan
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5/19/2025 9:47am
Not sure if the lower shock mount is replaceable for adjustment or if it has movement during travel?

Not sure if the lower shock mount is replaceable for adjustment or if it has movement during travel?

IMG 6709.jpeg?VersionId=t4T

Wasn't that supposed to be a changeable weight system, or am I mixing up my tech rumors?

2
chriskief
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Fantasy
5/19/2025 9:51am
Not sure if the lower shock mount is replaceable for adjustment or if it has movement during travel?

Not sure if the lower shock mount is replaceable for adjustment or if it has movement during travel?

IMG 6709.jpeg?VersionId=t4T

Wasn't that supposed to be a changeable weight system, or am I mixing up my tech rumors?

From the other site...

p5pb28160037
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krabo83
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5/19/2025 9:54am Edited Date/Time 5/19/2025 9:55am
Cougar797 wrote:
I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would...

I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would anyone want a 170mm plus 38 IF (and big if) this usd fork can be had for the same price as the current 38. The dual chamber air spring honestly is probably as big of an update as the chassis too. I bet that will find its way to the 38 regardless. 

Hub wise, like zuestman said above I have no serious concern that the 20mm axle bit will hurt its acceptance at all. Most hubs are convertible and honestly I'd rather have to adapt down to a 15mm axle on a 20mm hub then vise versa. 

wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to pedal around all day!

and after seeing what fox was able to achive with the new 36 (lighter & stiffer), i‘m confident that the next 38 will also manage those tasks.

3
Suns_PSD
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Austin, TX, USA
5/19/2025 10:23am

I am imagining that USD fork on a full power e-bike. If it's truly amazing in performance, even though I'm totally weight weenie, I'd eat 2800 grams or something once I get a full power.

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1
5/19/2025 10:33am

Maybe we need the Foes hub again... Didn't that thing use a 30mm axle?

Specialized had a 25mm axle on the E-150. Dual crown enduro fork before enduro was a "thing".

p4pb7948696.jpg?VersionId=k ejH66YQS.efrkvnReaxwDLMD0QN

 

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slimshady
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5/19/2025 11:00am

Maybe we need the Foes hub again... Didn't that thing use a 30mm axle?

Specialized had a 25mm axle on the E-150. Dual crown enduro fork before enduro was a "thing". 

Specialized had a 25mm axle on the E-150. Dual crown enduro fork before enduro was a "thing".

p4pb7948696.jpg?VersionId=k ejH66YQS.efrkvnReaxwDLMD0QN

 

Maverick forks had a 27mm axle that tapered to 24mm at the dropouts:

 

https://www.leelikesbikes.com/maverick-sc32-fork.html

4
Primoz
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5/19/2025 11:59am

Since the 15 mm standard proliferated, the majority of hubs are native 15 mm (or QR if convertible) and there are less and less 20 mm compatible hubs out there.

As for the Orbea, it's both, a weight carrying system and the lower shock mount. Probably there to be able to adapt it to less travel (shorter ETE shock) given the rumors that this is basically a new Rallon.

4
sethimus
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5/19/2025 12:47pm
Cougar797 wrote:
I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would...

I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would anyone want a 170mm plus 38 IF (and big if) this usd fork can be had for the same price as the current 38. The dual chamber air spring honestly is probably as big of an update as the chassis too. I bet that will find its way to the 38 regardless. 

Hub wise, like zuestman said above I have no serious concern that the 20mm axle bit will hurt its acceptance at all. Most hubs are convertible and honestly I'd rather have to adapt down to a 15mm axle on a 20mm hub then vise versa. 

krabo83 wrote:
wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to...

wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to pedal around all day!

and after seeing what fox was able to achive with the new 36 (lighter & stiffer), i‘m confident that the next 38 will also manage those tasks.

why can’t they make it light? intend can…

2
5
Nobble
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Lakewood, CO, USA
5/19/2025 2:26pm
Cougar797 wrote:
I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would...

I'd say that will be very much determined by performance benefit (or not) over the 38. If its suppler and has better wheel tracking why would anyone want a 170mm plus 38 IF (and big if) this usd fork can be had for the same price as the current 38. The dual chamber air spring honestly is probably as big of an update as the chassis too. I bet that will find its way to the 38 regardless. 

Hub wise, like zuestman said above I have no serious concern that the 20mm axle bit will hurt its acceptance at all. Most hubs are convertible and honestly I'd rather have to adapt down to a 15mm axle on a 20mm hub then vise versa. 

krabo83 wrote:
wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to...

wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to pedal around all day!

and after seeing what fox was able to achive with the new 36 (lighter & stiffer), i‘m confident that the next 38 will also manage those tasks.

sethimus wrote:

why can’t they make it light? intend can…

Plenty of people are out there pedaling dual crown forks around or converting their forks to coil.

If it performs well nobody will give two shits what it weighs.

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2
seanfisseli
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Santa Cruz, CA, USA
5/19/2025 2:45pm
krabo83 wrote:
wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to...

wait till we see the weight of the USD fork compared to the 38, cause jordi stated that it‘s heavy and probably nothing you want to pedal around all day!

and after seeing what fox was able to achive with the new 36 (lighter & stiffer), i‘m confident that the next 38 will also manage those tasks.

sethimus wrote:

why can’t they make it light? intend can…

Nobble wrote:
Plenty of people are out there pedaling dual crown forks around or converting their forks to coil.If it performs well nobody will give two shits what...

Plenty of people are out there pedaling dual crown forks around or converting their forks to coil.

If it performs well nobody will give two shits what it weighs.

People are riding 42lb enduro bikes and love them. Lightweight bikes were a curse to the sport. So many performance compromises in pursuit of light bikes.

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