I ride a "commuterized" MB in the city with a lot of stop & go. Going from 26x2" to 26x1.5" made a world of difference in acceleration. Part of that was the lower gearing (4%) from the smaller rear diameter. Same as going from a rear 25T cog to a 26T.
When I made the change, I could only afford 1 tire, so I did the front. I was so impressed, I changed the rear as soon as I could. It really helps me get across an intersection (and out of "harms way") from a stop much quicker.
Steady "cruising", the effect isn't so noticeable.
Last edited by Bill Kapaun; 05-27-08 at 02:35 PM.