All

Last year, for one of my engineering classes I did a simulation in Ansys titled “The influence of the axle diameter on the torsional stiffness in an USD bicycle fork”. It was an exercise more focused on Ansys, not on being scientific, but still the results were interesting. Here’s a link to the presentation . TLDR: 20mm was only 4% stiffer

In regard to front axles and stiffness of inverted forks, the angular deflection of a shaft is defined as θ=(T*L)/(J*G). The key variables for axles are J (polar moment of inertia since we're talking about circles) and G (shear modulus of the material). J for a circular cross section is J(r1,r2)=(π*((r1^4)-(r2^4)))/2 where r1 is the OD and r2 is the ID (zero if solid). As for G, the shear modulus of steel is approximately 3x that of aluminum. Now for a comparison between 15 and 20 mm axles... Lets say we have a solid 15 mm axle and want to...

7Mesh "leaking" the new Lyrik / Zeb in their 2026 clothing line promo shots. Noticed the air release buttons in crown. https://7mesh.com/en-US/products/mens-glidepath-short-14-in / https://7mesh.com/en-US/products/mens-glidepath-pant

Not only the effect as a lever, also the effect of localized stress through the mounting point instead of through a wider area through the helmet shell plays a big role here. Eg Schumacher's brain damage was caused partly by a camera that split the helmet iirc

Honestly the stock tune is fairly firm as-is.

Excellent thread. Looking at exactly this question the last few months. Ironically, as an upgrade from a Gen 2 Optic. To the Optic owners: do you have another longer travel bike to complement it? It's such a fun bike 90% of the time but in a few situations it would be nice to have an extra 20mm front and rear. And there's not really a weight penalty when the Optic is already built with a Float X, 36, enduro wheels and tires...

Thumbs up for the magazine. I miss print.

They have a few of the new forks on display at the Taipei show and they look really nice. Definitely a step up from the past few years, and the direct mount fender might be the best execution by any brand so far.

My hands started bleeding just looking at these pictures

Primary care doc here. There’s 4 symptom domains that concussions effect - the physical (headaches, light/sound sensitivity, balance and disequilibrium), cognitive (word finding difficulty, brain fog), emotional (frustration, depression, emotional lability, anger), and sleep (hypersomnolence or insomnia). Someone above suggests you obtain baseline testing. And that’s all well and good, though my experience as a doctor who has treated A LOT of concussions (though I’m not a sports med doc and don’t claim to be a concussion expert) is that the testing quantifies and scores a lot of things that I already knew from a few simple observations and has...