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Old 11-21-2013, 10:49 AM
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MotorBicycleRacing MotorBicycleRacing is offline
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Join Date: Jul 2010
Location: SoCal, Orange County.
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Default Re: interesting experiance, trying to blow up a china girl !!

Originally Posted by rogergendron1 View Post
OK SOB !!! to go 40mph with a 44 t sprocket i must have been reving her close to 11,000 rpm!!!

tire size 26in
10 t drive and a 44 t rear = 4.4:1 rear axle ratio
motor ratio is 5:1 reduced i think
and speed was 40 miles an hour i believe ... i was passing cars going 35 !

those numbers give me and engine rpm speed of 11,372 !!!

using this calculator

even if i say i was only doing 35, the same speed fo the cars i quickly passed the rpms would be ......... 9,951 !!!
26in tire, 44t rear sprocket, stock front sprocket, 40mph = what rpm ???
Your rpm's at 40.7 mph are 9500

20 tooth bevel gear to 82 tooth clutch gear = 4:1 to 1

Did you measure your tire diameter?
Most cruiser tires are 26.5" diameter which would make your RPM's 9,300

If you were going 35mph your RPM's were 8100

Last edited by MotorBicycleRacing; 11-21-2013 at 10:57 AM.
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