Join Date: Sep 2004
Location: Cushing, Oklahoma
Bikes: 1969 Peugeot U08, unknown MTB circa 1980, '93? Merckx MX-Leader
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You asked this just to cause controversy on this forum didn't you?
I find 700x23's are worlds faster than the original equipment 28 inch x 1.25's on my Peugeot U08. I even noticed a speed difference vis 700x25's. Other's here have not.
Remember, though, and I don't think there would be any controversy over this point, that even with tires with the same published measurements, there are actual differences in the size. AND, even if they are the same size, some of the 'racing-type" tires are much faster than the all-weather or more puncture resistant tires.
Play around with several different types. In the big scheme of things, tires are not all that expensive.