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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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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