Does anyone know how long is too long for sustaining higher RPMs? I commute about 20 miles each way everyday and I'm usually at 5000 RPM in 5th (85-90mph) for 15 of those miles. Should there be any cause for concern about how long the engine will last, or is this RPM nothing for the bike to handle? I only ask because I'm thinking of replacing the front sprocket with a 19T.
Thanks
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