otto
Full Member
Elvira, 78 oh so Special
Posts: 171
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Post by otto on Jun 27, 2006 20:37:33 GMT -5
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panic
New Member
Posts: 49
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Post by panic on Jul 13, 2009 15:28:30 GMT -5
My version:  |
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Post by pamcopete on Jul 13, 2009 15:46:58 GMT -5
Well, the problem with these charts is that they rely on tire circumference. There is no accurate way to measure or calculate the effective tire circumference. The cross section of a motorcycle tire is circular, meaning that it has an infinite number of circumferences. The effective circumference is further influenced by tire pressure and tread design. The only measurement that is accurate is the rolling distance of the rear tire for one revolution. 1. Mark the sidewall and floor. 2. Roll the bike forward for exactly one revolution of the rear tire.. 3. Mark the floor again where the side wall mark stops. 4. Measure the distance between the marks on the floor. Use the resultant distance for the circumference of the tire. This Excel spreadsheet is set up for rolling distance. www.amckayltd.com/xs650revs.xlsFor even greater accuracy, roll the bike forward for two revolutions of the rear tire and divide the rolling distance by 2. The difference between rolling distance and measured or calculated circumference of the tire can be as great as 2", which equates to about 100 RPM difference @ 60MPH. |
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Post by terribletabo1 on Aug 29, 2011 21:05:59 GMT -5
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Post by ShakerNorm on Aug 30, 2011 20:41:29 GMT -5
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