Get the "rolling radii" from Firestone. Divide that number from the big tire into the same number of the small tire. It will come out as a number less than one. Something like .92 but do the math to find out. Multiply that number by the speed given in CNKS's post. That will give you the speed with the small tires in any gear you select. As you may know, tire wear on your tires will affect the MPH. But not a whole lot. Slippage will also have an effect.
(As a side note, notice the correct use of the words "affect" and "effect"). Thanks Miss Grundy.
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