Seller notes

Product description: ★According to the initial data, our model can match it very well. ★Easy to install. Stable characteristics and high reliability. ★The transmission ratio is 15T/52T. ★The average top speed gain on flat ground is 7 to 10 mph (depending on other modifications on your bike). ★Suitable for GY6 49cc 50cc 139QMB 4 stroke Chinese scooter, ATV, engine with standard or large caliber package. Product specifications: color: gray material: metal Diameter: about 6.7 cm (2.6 inch...

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