Australian Cycling Forums - Bicycles Network Australia

hugh stone wrote:Had a pair of carbon rims arrive in the post today which are a bit wider than expected. Specs stated them as being 25mm wide, which they are at the outer edge but get wider in the middle to 27.5mm. It'll be pretty close to the frame near the chainstays/BB area.

Makes me wonder about reports of pros preferring 25mm tyres and the trend towards wide rim wheels - surely there must be some clearance issues, particularly with tight aero framesets.

I know I had some rub issues if I run 25mm tyres on a wide rim wheel (18.5mm internal rim width) as the tyre ends up measuring closer to 27mm.

Lynton wrote:
My new mavic Ksyrium SLS wheels came with Mavic Yksiom 23mm tyres which I took oof because I read bad reviews abut their wet weather perfomance but I might put them back on.

cerb wrote:You CAN run 25's at lower pressure and this is one of the key drawcard's of using them. You can also still put 120psi in them if you want to. If you do, you don't get the increased comfort possible by running lower pressures.

Pressure depends on conditions (wet/dry), road surface, rider weight and other factors. Typically, people run between 90-110psi.

Bourney wrote:Recently switched from 23mm to 25mm on my Propel, and agree with others that it has really smoothed the ride out.

Obviously it doesn't feel like I'm on a cloud, but the really harsh vibrations and bumps have been smoothed out.

Definitely a noticeable difference, and I'm glad I made the switch.

g-boaf wrote:

cerb wrote:You CAN run 25's at lower pressure and this is one of the key drawcard's of using them. You can also still put 120psi in them if you want to. If you do, you don't get the increased comfort possible by running lower pressures.

Pressure depends on conditions (wet/dry), road surface, rider weight and other factors. Typically, people run between 90-110psi.

I think the 25mm are still much nicer than 23mm for the ride quality. I've always used 23mm but recently switched to 25mm. I still use 110-115psi and the difference between 25mm and 23mm is massive. I've stopped a few times just to make sure everything is okay with them. I doubt I'll be changing back to 23 again.

I've got no troubles with the 25mm on the TCR Advanced SL frame I run, clearance is easy, and they even clear the brakes no trouble, though I'm using Planet X Ultra-light CNC brakes, the only part of the bike that isn't Shimano Dura Ace 9000.

idler wrote:

My experience is different. I used to pump my 25 mm tyres up to 105-110psi (Veloflex or GP4000s) but I couldn't really tell much difference between them and 23s. It wasn't until I went to 90 -100 psi that I felt the main difference came through - bike actually feels faster and more secure and comfortable at the lower tyre pressure. Both bikes that have the 25s are steel frames BTW.