Motorcycle Riding & Gear Calculators
Free, practical tools for the numbers behind riding — work out your gearing and speed per gear, plan a tank of fuel, understand corner lean angles, convert tyre sizes and speedo error, and size your helmet, jacket, and gloves to your body.
Chain & Sprocket Ratio Calculator
Get your final drive ratio from front and rear sprocket teeth, then compare a new pair to see the trade between acceleration and top speed
Gear Speed Calculator
See your road speed in every gear from engine RPM, rear tyre size, and the primary, gearbox, and final drive ratios
Fuel Range & Cost Calculator
Estimate how far a tank will take you from capacity and economy, plus the fuel and cost for a planned ride — in L/100km, km/L, or mpg
Lean Angle & Cornering Calculator
Find the lean angle a corner needs from its radius and your speed, or the max speed a given lean can hold — using θ = atan(v²/(r·g))
Tire Size Converter & Speedo Error Calculator
Turn a size like 180/55-17 into overall diameter and circumference, and compare two tyres to find the speedometer error
Riding Gear Fit & Sizing Calculator
Turn your head, chest, and hand measurements into helmet, jacket, and glove size bands, with how to measure and what a correct fit feels like