What's your favourite gear ratio?

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EEI

Calling Tester, calling Tester...... Do you have a mathematical formula for calculating RPM from mph by gear ratio? Initially, I'm interested in 48:18 with 21mm tyres, but if there's an adaptable formula for different ratios it would be very welcome!

Ca. 96 rpm @20 mph

Oh, a "Bike Gears" app has all the calculations - you just move the slider.

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