Originally Posted by
jethro56
While I agree with much of what RichardGlover says, one thing that is lacking is the flywheel effect. The weight of heavy tires effects acceleration much more than that same weight on a nonrotating componet.
Perhaps, but you're probably talking about fractions of a watt. My PowerTap power meter doesn't seem to show any statistically significant difference between 23mm, 25mm, and 28mm tires...