This final drive gear will fit 50cc scooters with the following codes: 139QMa, 139QMB, BN139QMB
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The final drive gear in a motorcycle transmits power from the transmission to the rear wheel, providing the necessary torque and speed reduction to propel the bike forward.
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This final drive gear will fit 50cc scooters with the following codes: 139QMa, 139QMB, BN139QMB
