The more a tire looks like a racing bicycle tire the better.
Keep in mind, a 4 speed manual in 4th is more efficient than a 5 spd OD manual in fifth given the the same total drive train ratio. (3 to 1 diff times 1 to 1 for the 4 spd and a 3.75 diff times 0.8 for the 5 spd.) i usually shift 1,3,5 with my 5 spd anyway. The old granny gear first, four speeds work great with about a 2.5 diff.
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