Taller Tires Needed

remytherat said

The speed at a given rpm is directly proportional to tire height. A 10% increase in height means a 10% increase in speed at a given rpm, or a 10% decrease in rpm at a given speed. On the other hand, with your current specs you should be cruising 3400 at 70, not hitting 4k until around 83.

A 29” tire should put you just over 3k at 70.

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My speedometer cable isn't working. All I had was a tachometer. I was in the slow lane and EVERYBODY was passing me on I-75 so I assumed I was doing about 70 and they were doing 75-80 in the other two lanes. Regardless I was doing 4000 RPM and was getting passed by EVERYONE so I know I need to lower my RPM's because I can't drive on the interstate at 4000 RPM's. But I need to be able to run at least as fast as I was going (whatever that was) or else I'll be getting run over. :BangHead: