Let me jump in here as I am buying rear tires for a 4wd and think I am correct. Will take numbers posted by TIM S below with his Deere:
He says: 411 rears and 410 fronts. Assume engine is turning 5000 rpm. 5000/411 = 12.165 rpms. The front is 5000/410 = 12.195.
12.195/12.165 = 0.00247 or 0.2 ½% faster than the rear (aka just slightly). I agree that it has to run faster to be able to pull around a corner. Otherwise it is going to be pushed sideways (like turning a 2wd.....obviously by a much smaller amount but pushed none the less) by the rears.
On the different radii of the circles, I don't think it has a thing to do with it. The drive is from the engine to the differentials regardless of the wheel positions. The wheels will have to follow the gearing, unlike a 2wd where the front wheels are free to follow the friction of the surface.
On taller one would think higher ratio and the 411 would be taller than the 410.
This is all speculation on my part so I am open for contributing comments as I too am interested in the correct answer.
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