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Old 06-08-18, 06:34 AM
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Location: casper wy usa
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Bikes: brompton sl, surly steamroller, fuji track, gary fisher bmx minivelo etc

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When I use the Sheldon Brown gear inch calculator with 16 inch wheels and 1 3/8 tires, 54 tooth chainring and 12 tooth sprocket, I get 72.3 gear inches not 74. Can anyone explain this?
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