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Founded in 1991, Ningbo Sunrun Bicycle Co., ltd & Its branch company Ningbo Tongkin Technology Co., Ltd.

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  • Single Speed Freewheel
    A single-speed flywheel is a bicycle transmission component that allows the rider to coast without pedalling while still providing the ability to pedal forwards. It is commonly found on single-speed bicycles and some other types of bicycles that are not shifted, and has become popular in recent years on new national st...
  • Pedal Assist E-Bike Kit
    In order to adapt to the product upgrading and development needs of bicycle and electric bicycle market, our company has invested a lot of scientific research funds, recruited senior engineers and technicians in the industry, and set up a project to develop high-tech centre shaft torque sensor and its supporting periph...
  • Bicycle Disc Brake
    A bicycle disc brake is a braking device that applies the brakes by means of a clamp (or caliper) acting on a steel disc fixed to the hub. The main difference between disc brakes and "V" brakes is the braking principle and setup. Disc brakes can be divided into two types: cable-pull disc brakes (mechanical) and hydraul...
  • Multiple Freewheel
    A bicycle multi-stage spinning flywheel is an important part of a bicycle gearbox, while a multi-stage flywheel is based on a single-stage flywheel with several additional flywheel blades, which are combined with a sprocket on the centre axle to make up a variety of different transfer ratios to change the speed of the ...
  • Rear Derailleur
    Rear derailleur is an important part of bicycle drivetrain, which is responsible for receiving the chain from the front derailleur and connecting it to the rear wheel for power transmission and gear shifting. Our different types of rear derailleurs can be adapted to a wide range of speeds of mountain bikes and road bik...
  • Bicycle Hub
    Hub skins are usually located at the centre of the axle of the front and rear wheels of bicycles, and are usually made of metal or synthetic materials with a certain degree of hardness and durability to withstand the rotation and bumps from the wheels. We produce a wide range of high-grade aluminium alloy axle housings...
  • Cassette Sprocket
    Cassette flywheel has the following features: GOOD WEIGHT BALANCE: Cassette flywheel puts the centre of gravity at the centre by balancing the counterweights, so that the different parts can all move in a balanced way, thus effectively reducing the vibration and shaking during the movement of each part, and this design...
  • Chainwheel & Crank Set
    The sprocket crankset is the driving component of a bicycle, which includes the crank, sprocket and pedals. When the rider steps on the pedals, the force is transferred to the sprocket crankset through the chain to move the bicycle forward. Sprocket crankset is usually made of aluminium alloy or steel, which has the ch...
  • Front Derailleur
    The front derailleur is an important part of the bicycle drivetrain, and its main function is to move the chain between the sprockets on the crankset. The front derailleur has the function of derailing the chain from one sprocket and pushing it onto another sprocket with an unused number of teeth. It can be manoeuvred ...
  • Shifter Transmission Group Set Series
    Bicycle shifting transmission kit series contains a series of accessories such as controller, front derailleur, rear derailleur, flywheel, axle skin, sprocket crank, brake and other components combined into the shifting transmission system, our company focuses on providing one-stop solution for bicycle shifting transmi...
  • Brake Lever
    Usually located on the handlebars of a bicycle, the gate handle is an important part used to slow down, stop or control the direction of the vehicle. The handlebars are divided into left and right handles and are controlled by the force of a hand squeeze or foot pedal. When the force of the hand pinch or foot pedal is ...
  • Trigger Shifter
    A Finger Controller is a component of a bicycle's shifting system used to control the shifting of the front or rear derailleur. Finger controls are usually located on the handlebar and are used to control the shifting of either the front or rear derailleur with the flick of a finger. The main purpose of a finger-paddle...
  • Twist Shifter
    Bicycle turnbuckle controller is a kind of shifting component of bicycle, which controls the shifting of front and rear chainstay by pulling the cable, and is mainly applied to mountain bikes and folding bikes. Turnbuckle shifting is characterised by simple, fast and convenient operation, which can complete shifting in...
  • Bottom Bracket Sets
    The centre column is the middle part of the bicycle, located between the footpegs and the rear wheel, and is one of the core components of the bicycle. It not only supports the weight of the whole bicycle, but also transmits the force generated by the footpegs to the rear wheel, so that the bicycle generates forward mo...