Quote:
Originally Posted by Megadan
With my 17/43 sprocket combination (2.53:1) on a 120/80-18 tire - a 25.56" diameter tire (smaller diameter than the stock tire) My bike sits at about 6300rpm (via tach cluster) at 60mph. Something seems off with your math to come up with the same rpm on a stock tire and gearing.
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I didn't have a wheel to measure, so calculated it for illustration purposes, I came up with a diameter very close to yours. Also, the guy who asked the original question was running a 16/40, which is, (I think) 2.5. So the final drive ratios are also very close. So, I'm not surprised the rpm numbers are so close....ARH