Originally Posted by
Ross520
32mm tires have less rolling resistance than 25s or 28s, however, they are heavier, and less aerodynamic, so in the real-word, they're slower.
My 32mm tires are barely heavier than a GP5K 28mm. I can't argue the aero thing. I don't think I lost any speed going to them. They are uncommonly good 32mm tires, though, not cheap, heavy, and stiff.