AJ/FormS said

I did the tire swapping business for a few years. From the max of 28"" to a 24.5 is about the same as from 3.91s to 3.45s.
So; with 3.91s and 24.5s , 65=3490
and with 28s; 65=3050; both at zeroslip
poorman's overdrive.

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