Wide(r) tires on standard rims

[FastforaSlowGuy]

I'm buying tires for my race wheels and am thinking of stepping up a size. The wheels are Reynolds 32s (tubular), which are 21mm wide. I have been racing on Vittoria SC 23mm the last couple years, and was thinking of going up to 25mm. I'm not looking for more comfort (though that would be a plus) as much as I am cornering grip.

On a fairly standard-width rim, has anyone seen a downside to sizing up?

[ergott]

No problem at all. Don't forget people glue up cyclocross tires to rims that width.

[kgreene10]

You get more grip and more comfort but less aerodynamics. For instance, Zipp does it's tests with 21mm tires.

[skijoring]

**, nevermind.