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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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