Originally Posted by
wolfchild
They won't slow you down much if you keep them pumped up to full pressure.
Things such as wind, terrain, hills, traffic lights, stops, road conditions have a much greater effect on speed than tires.
We all believed this for years, until power meters became affordable.
Then the evidence showed that larger tires and lower pressure rolled as well if not better than skinny high pressure tires. Shoot, I used to pump up to 120psi to do century rides. Never again...
For many tires, your maximum pressure should be the minimum pressure listed on the sidewall. But yeah, full pressure does feel faster, doesn't it?