>>1368585IDK for a bicycle, I like a thinner rear wheel, because lower rolling resistance, most of your weight is over the rear.......Also handling, I would say a bicycle is prone to understeer naturally (all the weight is on the back), so it's not like a motorcycle in my opinion where you're putting much power to the rear wheel. I would put the 2.1" in the back, and the 2.6" in the front personally. Currently have basically that, Maxxis DHF 2.5" front, and Kenda K-RAD 2.3" rear.