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Having a tire diameter/ circumference that is slightly larger than stock (24.7") is an easy way to gain some longer gearing. Going out to the full 28" is only a 13% increase in final gearing which is about the minimum increase that you will want. 15/ 36 sprockets give 16% longer gearing with the stock tire and I may go to a 35, which is the smallest that can fit, when my 36 wears out. The most efficient highway cruise rpm is under 6,000. With 15/ 36 I get 68mph at 6,000.
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