Tires, 23's vs. 25's, brands?

[HappyAnika]

For all of you who have struggled to change a tire, try this nifty little tool from Crank Brothers:

http://www.crankbrothers.com/speedlever.php

Thanks, this might be the gadget someone at work today was trying to explain to me.

Do you really think you are going 0.5mph slower? That's a lot!

Its hard to say, the two rides I did this weekend were routes I'd never done before, and for once there was little wind (Yippee! ). I averaged about 0.5 mph faster than most of my rides this month. The best gauge will be my 20 mi. ride into work during which the riding conditions are typically very repeatable, but I won't be doing that until next week.