I am trying to get optimum rpm at cruise. I have a 46 chevy on an s10 frame with approx 300 hp 350 with 400 trans and 3.42 rear. I am trying to get the right diameter tires. I will be using 15 inch wheels. I have used the ratio calculator and I don't know what rpm I should be shooting for at 55 mph. Examples, 25.5 dia tire. 2478 @ 55
26.1 dia tire. 2422 @ 55
28. Dia tire. 2257 @ 55

Last edited by homer52; 12/03/2016 7:24 AM.
1941 Chevy
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