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KARTSHOP.COM Gear CalculatorGear ratio, chain length and top speed in one place. Every number updates as you type. Setup From the centre of the front sprocket to the centre of the rear axle. Fills in max rpm. You can still change the number yourself. Measure all the way around the tyre Wrap a tape measure around the widest part of the rear tyre, in the middle of the tread, and read where the tape meets. Use the tyre pressure you race with. Example: 880 mm circumference ≈ 280 mm diameter. Gear ratioR = z2 / z1 7.091 — Theoretical top speed at max rpm Chain length—links (even number) Measure around the outside of chain and sprockets, resting on the teeth. —links Gear ratio table Current Within ±1.5% of current ratio Click a cell to choose that combination. |