Ningbo Tongkin Technology Co., Ltd.

Founded in 1991, Ningbo Sunrun Bicycle Co., ltd & Its branch company Ningbo Tongkin Technology Co., Ltd.. are the professional engaged in producing

bicycle & e-bike transmission system & brake system parts manufacturer

. 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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Product Center

The top-of-the-line transmission kit provides a large transmission ratio range to adapt to complex terrain. At this point, nothing can limit a rider’s heart.

1 Single Speed Freewheel Single Speed Freewheel
A single-speed flywheel is a bicycle transmission component that allows the rider to coast without p...
2 Pedal Assist E-Bike Kit Pedal Assist E-Bike Kit
In order to adapt to the product upgrading and development needs of bicycle and electric bicycle mar...
3 Bicycle Disc Brake Bicycle Disc Brake
A bicycle disc brake is a braking device that applies the brakes by means of a clamp (or caliper) ac...
4 Multiple Freewheel Multiple Freewheel
A bicycle multi-stage spinning flywheel is an important part of a bicycle gearbox, while a multi-sta...
5 Rear Derailleur Rear Derailleur
Rear derailleur is an important part of bicycle drivetrain, which is responsible for receiving the c...
6 Bicycle Hub Bicycle Hub
Hub skins are usually located at the centre of the axle of the front and rear wheels of bicycles, an...
7 Cassette Sprocket Cassette Sprocket
Cassette flywheel has the following features: GOOD WEIGHT BALANCE: Cassette flywheel puts the centre...
8 Chainwheel & Crank Set Chainwheel & Crank Set
The sprocket crankset is the driving component of a bicycle, which includes the crank, sprocket and ...
9 Front Derailleur Front Derailleur
The front derailleur is an important part of the bicycle drivetrain, and its main function is to mov...
10 Shifter Transmission Group Set Series Shifter Transmission Group Set Series
Bicycle shifting transmission kit series contains a series of accessories such as controller, front ...
11 Brake Lever Brake Lever
Usually located on the handlebars of a bicycle, the gate handle is an important part used to slow do...
12 Trigger Shifter Trigger Shifter
A Finger Controller is a component of a bicycle's shifting system used to control the shifting of th...
13 Twist Shifter Twist Shifter
Bicycle turnbuckle controller is a kind of shifting component of bicycle, which controls the shiftin...
14 Bottom Bracket Sets Bottom Bracket Sets
The centre column is the middle part of the bicycle, located between the footpegs and the rear wheel...

Ready For Your New Bike?

Cassette Sprocket
CS-M834

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Displayer Control Panel
DP-M5
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Twist Shifter
SL-E100
Cassette Sprocket
CS-M834

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Disc Brake
SR-BR-D01
Rear Derailleur
RD-M310

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Crank Set
EB01-2201
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Bottom Bracket Torque Sensor
BBTS-68-145

Why Choose Us

The transmission kit provides a large transmission ratio range to adapt to complex terrain. At this point, nothing can limit a rider’s heart.

Customization
We have a strong R&D team that can develop and produce products based on drawings or samples provided by customers.
Cost
We have two of our own foundries and processing plants, factory direct sales, high quality and low price.
Quality
We have our own laboratory and testing equipment to ensure product quality.
Capacity
Our annual output exceeds 10 million sets of accessories, which can meet the needs of customers with different purchasing volumes.