Originally Posted by Yen
I'm curious about the difference in speed on the 700x28 tires, vs. my 700x40. The narrower tire enables you to cover more distance with less effort... true?
The big difference is 120 PSI compared to 80 or less. There is much less rolling resistance provided the ground is hard enough. That is the issue on Limestone. After or during a heavy rain you loose all the advantage. But it is much faster on asphalt or dry Limestone.
Yes, a narrower tire is faster than a wider tire and slicks are faster than knobby, much faster.
Again, only on hard surfaces. The big tires have their place but kill you on long trips.
See this link below if you are interested.
http://kreuzotter.de/english/espeed.htm