Thread: working out speed from gear ratio, diff standard 2wd
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Old Nov 28, 2007 | 09:19 AM
  #13  
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TiB
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From: Blackpool
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Measure your tyre again in mm's.

Then divide... 1 609 344 millimeters x the number of mm's your tyre measures. (my guess is it'll be around 820) thats your revolutions per mile.

Then do your equation again like you did at the top of this page

ps.. its revolutions per MILE not per MINUTE
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