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Gearing K Sharpe 12-20-03  
Looking for information or website dealing with rear gearing or replaceing gearing for lowering RPM's...any information would be appreciated.
Re: Gearing kd5kfl 12-22-03  
The formula:

MPH = RPM X LRTR / GR X 168

Where:

MPH = obvious

RPM = Engine RPM

LRTR = Loaded Rear Tire Radius. Axle center to pavement.

GR = Overall gear ration. Trans ratio X Rear end.

168 = Fudge factor. Handles conversion of revs per MINUTE to miles per HOUR, radius in INCHES to MILES per hour.

Some people use a bogus variation on this formula: Rear Tire diameter, fudge factor 336. Wrongo - portion of tire above the ground does not affect speed, this formula does not take loading into account.
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