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Natural frequency is proportional to mass and stiffness, and since stiffness is the same it will just be determined by the difference in mass. I agree we’re probably not anywhere near approaching the natural frequency of any of the axles, but I would think it would make a tangible difference well before that point anyway.
Stiffness is just displacement under a given load. Steel and aluminum will have different material damping and rebound properties even when their stiffness is identical. I’m imagining the legs of an inverted fork can be thought of like a tuning fork, and axle material will change how that tuning fork sounds.

MikeyE Liked a reply to forum topic FOX Podium Inverted MTB Fork - Questions, Answers, Reviews

6/28/2025 11:21am
Long story short, Mr. Robot is right, the fork is really good, like really really good. Tried to burp a little air out of the fork and got a little oil on my rotor but other than that, setup was straight forward and I am happy.
This forum topic has 241 replies.
Here’s a follow up with no cuts or edits. You can see the moment the alignment falls apart. https://www.instagram.com/reel/DLats-VBq-e/?igsh=NTc4MTIwNjQ2YQ== I agree most (all) of these guys have attitude and ego problems, but I think specifically what Diaz is calling out here is of value. Even if it doesn’t reflect Fox’s quality control at all (though I think people are right...

Blake_Motley Added a comment about product review Podium Factory

6/24/2025 9:13am
My credit card is not prepared for what’s coming
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This product review has 1 comment.

Jason_Schroeder Liked a reply to forum topic MTB Tech Rumors and Innovation

6/17/2025 7:45am
We tested Crankbrothers new Synthesis Enduro Alloy 2.0 wheels that launched today and were super impressed by how stout and durable they were. Our tester Mikey has broken every wheel I've ever seen him ride, and these wheels have made it just about 4 months completely unscathed. Which honestly speaks more to their durability than Commencal/Muc-Off racing with them 😂 They're sold as individual wheels, but complete sets retail for $700 (CB hubs) and $900 (i9 hubs), and the rims carry a lifetime warranty—a first for Crankbrothers on alloy rims. There is also a DH/e-MTB model. https://www.vitalmtb.com/product/guide/wheelsets/crankbrothers/synthesi… Highlights - Reinforced...
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This is where the argument for measuring at the wheel comes from - you are correct when looking at % sag at the wheel, but the change in rate through the stroke means you have an inversion of % shock stroke used vs % of wheel travel used. Ie on a progressive bike, 25% shock sag might equal 30% wheel travel and 75% at the shock is 70% at the wheel. But on a more linear bike 30% at the shock might be 25% at the wheel.
This forum topic has 48 replies.

AG Pennypacker Liked a reply to forum topic Have We Been Measuring Sag Wrong? (and how to fix it...)

6/16/2025 5:34am
Hard to take a guy serious that rides Kendas.
This forum topic has 48 replies.
This strikes me as excessive. Sag is a relative measurement anyway, there’s very little value in actually knowing the number. I guess you can get a little more precision out of it, and it could be cool to have as a team or a shop, but it’s pretty expensive for an individual

veefour Liked a reply to forum topic 2025 World Cup Downhill / EDR - Leogang, Austria

6/8/2025 8:34pm
I'm glad you got to see it. "Video unavailable" popped up on my screen halfway through Till's run. I guess it's because I paused watching to take a phone call. Refreshing does nothing and it's no longer on my feed. FFS I love this sport, but I'm getting close to just giving up with these useless twats.
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TEAMROBOT Liked a reply to forum topic MTB Tech Rumors and Innovation

6/8/2025 2:39pm
lol so good. I expect reactions would be... unique.
This forum topic has 30444 replies.