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Sumo gearing for txc450

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What would be your highest 'comfortable' cruising rpm at 65-70mph? I recently put a 15t front on with a 42t rear and I'm doing about 5.7k rpms at 65. Is this too high for any length of time?

Not sure I'd want to go any taller w/o low suffering. Not planning on any long highway rides.

Thanks!

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DRZ SM likes 15/39, a 462cc with cam, carb & exhaust can pull 16/39 at frwy speeds.

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Rode out to my daughter's house yesterday and took the freeway. 70mph is about 6200 rpm. Seat, bars and pegs got real buzzy there. Any slower and I'd get run over! I don't think a 16t front will fit, the 15 is close to hitting the swingarm now. Might have to order a 40 or 39 rear, down from 42 now. Or stay off the freeway!

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