Gear Calculator Gear and Cadence Calculator - Designed by Ian Pettitt Chainring size: teeth Sprocket size: teeth Time: min sec Distance: Metres Miles Results Speed: miles per hour km per hour Gear Size Cadence English Size: inches Rpm (Lopro, 18mm tyres) = Metric (Lopro, 18mm tyres) = metres Rpm (Normal road tyres) = Metric (Normal road tyres) = metres