Founded in 1991, Ningbo Sunrun Bicycle Co., ltd & Its branch company Ningbo Tongkin Technology Co., Ltd. are the professional manufacturer engaged in producing bicycle 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, torque sensor B.B sets, total 7 series and about 300 models.

Bicycle shifter, front derailleur, rear derailleur, freewheel, cassette sprocket, chainwheel and crank sets, hubs, brake sets