23mm vs 25mm Tyres ..

[softy]

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.

Remember the pros use tubulars, theses don't need the wider clinchers and generally they work out rounder and run with better clearance

[schroeds]

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.

FWIW I've been using the Mavics for 6 months and very happy with them. Formerly used Schwalbe One for ages and these seem just as good and so far no punctures

sorry if off topic

[g-boaf]

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.

[Bourney]

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]

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.

I was out most of the day on the bike and it was quite fine on 25mm tyres, exactly as you described. Just the nasty little bumps are smoothed out, the tyres take the harshness out of them. Little bit more compliant. They roll nicely too.

[idler]

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.

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.

[biker jk]

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.

I agree. My Merida disc brake road bike came with 25mm tyres and I run them 15 psi lower than the 23mm tyres on the Lynskey. If I ran the 25mm tyres at 110psi there would be next to no improvement in ride comfort.

[silentC]

I run my front at 70 and my back at 80. If I put too much in the front it gets a bit dancey when descending at speed and I don't like that