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Ningbo Tongkin Technology Co., Ltd.

Founded in 1991, Ningbo Sunrun Bicycle Co., ltd & Its branch company Ningbo Tongkin Technology Co., Ltd. are the professional manufacturers engaged in producing bicycle & e-bike transmission system & brake system parts. The key products range include derailleur sets, freewheels, cassette sprocket, cassette hub, disc brake & V brake sets, chainwheel & crank set, E-bike torque sensor B.B sets, controller, motor, mid-motor, displayer and another E-BIKE series components, etc. total 10 series and about 300 models.

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