Quote:
Originally Posted by GTpilot
That's exactly what happens. The 25 has a shorter but rounder contact patch over the longer one for 23s. Longitudally the 25 has less rolling resistance.
Many pros are now running 25mm tyres for that exact reason.
EDIT: More info here http://www.competitivecyclist.com/learn/25-vs-23 |
Interesting, when I started road racing we all rode 27x1 on your high end race bike and 27x1 1/8 on your training bike. Yes I have been in this sport long enough to remember imperial sizes. The idea was to go narrow and hard on race wheels.
Then came the metrics and the practice was the same but even more so as the metrics came narrower than the imperials did and I remember running 23 on my training wheels, 21 on my road race wheels and 19 (@160-180 psi) on my TT bike. The ride quality on a tubular (singles) in a 19 at 160 psi was awful, you might as well be riding concrete wheels but that same sensation made you think it was fast.
Now it seems we were wrong all that time.