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Old 02-29-2012, 11:18 PM
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There are several rpm/speed calculators online.
Input a few Rear ratios, Tire sizes etc.. to see what the rpms will be.
Here's a few:
2nd down >>

I wouldn't go highwer than 3.73 if you plan on crusing the road. 3.42, 3.55 are good all around ratios.
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