Originally Posted by knobster
Couldn't agree more. My Trek 520 has 32's and is very comfortable. Problem is the weight. When I get done with a long ride I am beyond tired. I don't hurt, but can barely function. My other bikes are not as comfortable, but I am nowhere near as tired, but my body hurts. Wonder if putting larger tires (already have 25's) on the faster bike would make up for the comfort issue on longer rides?
Edit: Or maybe get my lazy ass in the gym.
In some cases wider tires roll faster than narrow tires.
VBQ / Bicycle Quarterly had a good testing article on it a while back.
Depends on the materials in the tire, tread thickness, tread hardness, pressure etc.
I'm riding 25's at the moment. Had some Schwalbe Marathon 28s on it but they were really slow. Looking forward to my UPS of Continental GP 28's. I like their 25's but want a little more cush for the long haul.