I find bigger tires a lot slower, but honestly that is only an issue over 15mph. Below that the bigger tire is probably better.
smaller tires are a lot lighter, have less rolling resistance, and are more aerodynamic. Its been proven, but those tests really show the difference only makes a difference at speeds over 15mph.
I know that velonews talks about larger tires having less rolling resistance, but that is only at the same PSI. Who the heck inflates a 32mm and a 25mm tire at the same PSI?
Originally Posted by
Burton
People keep saying big tires are slower, but its not a reality. Regardless of the tire size - if the tire has a round profile - you'll just be riding on the crown anyway. HEAVY tires can be an issue, but today, for a premium, you can get wide tires that weigh no more (sometimes less) than the most commonly used smaller touring and commuting tires.