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Calculate Bicycle Gear Inches . That’s 6.39 metres for the 700×28c bike with 48/16 gearing, above. Then multiply this figure by pi (3.14) and convert to metric. Gearing Charts Metric, Imperial & Gear Roll Out Bob's Bikes Matamata from www.bobsbikes.net If a bike with 20 wheels and a bike with 29 wheels both have the same gear ratio, the 29 bike will travel 45% farther with each revolution of the crank. A 42 front x 21 rear: But i frequently went back and forth between fourth and fifth gear, which is an indication that the optimal bicycle gear ratio lies between 2.11 and 2.53 for standard road use.