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

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Chainwheel & Crank Set Factory
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Chainwheel & Crank Set Manufacturer

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 characteristics of light weight, high strength and corrosion resistance. Our sprocket cranksets are designed and manufactured with precise craftsmanship and strict inspection to ensure their stability and safety in use.
Sprocket crankset is one of the key components in the transmission system of a bicycle. They not only bear the rider's pedalling force directly, but also transmit the force to the rear wheel to push the bicycle forward. Therefore, the manufacturing quality and precision of the sprocket crankset is crucial to ensure the normal operation of the bicycle and the safety of the rider.
It is important to note that sprocket cranksets require regular maintenance and care. Riders should keep the footpegs and chain clean and lubricated, and regularly check their fasteners for looseness or wear. If any problems are found, they should be dealt with promptly to avoid potential safety hazards.
Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Tongkin Technology Co., Ltd. is a China Chainwheels Manufacturer and Cranksets Factory, was founded in 1991, specializing in the production of bicycle transmission systems, braking systems and other components. The leading products include a series of derailleurs, variable speed flywheels, high-end cassette hubs, disc brakes, brake components, cranksets and more than 300 varieties in six categories.

In 2015, in response to Made in China 2025, the company established Ningbo Dongjin Technology Co., Ltd. to develop a new internal and external variable speed transmission system, entering the first echelon of the domestic industry. "Chicheng wheel industry, quality first" is the pursuit of quality by Richeng people. The company has introduced internationally advanced key technologies such as precision cold forging, CNC machining, heat treatment, and multi-station stamping to develop transmissions with Richeng characteristics. , transmission kit, sales volume leads domestic peers. The registered brands SUNRUN, TONGKEEN and HEMU enjoy high reputation in domestic and foreign markets. The company has independent export rights, and its products are exported to Europe, North America, Central and South America, Africa, Southeast Asia and other countries and regions. Xu Mingqiang, chairman of the company, sincerely invites domestic and foreign merchants to come for negotiation and guidance.


Chainwheel & Crank Set Industry knowledge

How should I check the status of Chainwheel & Crank Set before installation?

Before installing the Chainwheel & Crank Set, it is crucial to conduct a detailed inspection because it is related to the smooth progress of subsequent installation and the overall performance of the bicycle transmission system. Here are some detailed steps and notes on how to check the status of your Chainwheel & Crank Set:
First, we need to check the surface condition of Chainwheel. Check whether the teeth of the Chainwheel are intact and whether they are broken or severely worn. The integrity of the teeth directly affects the bite effect of the chain, which in turn affects the efficiency of the transmission. At the same time, also check whether there is any rust or dirt on the surface of the Chainwheel, which will reduce the transmission efficiency and may even cause the chain to slip.
Secondly, for the crank set, we need to check the crank arm for cracks or deformation. The crank arm is a key component that bears the rider's force and transmits it to the Chainwheel. Its strength and stability directly affect the reliability of the transmission. In addition, we also need to check the interface between the crankshaft and the frame to ensure that it is smooth and free of damage for smooth installation.
While checking the Chainwheel & Crank Set, we also need to pay attention to the cooperation between them. For example, whether the fit between the chainwheel and the crankshaft is tight, and whether there is any shaking or looseness. This loose fit may result in energy loss during the transmission process and may even cause safety hazards.
In addition, we also check whether the specifications and models of the Chainwheel & Crank Set match our bikes. Different bicycles may require different specifications of Chainwheel & Crank Set, and wrong specifications may cause installation difficulties or poor transmission effects.
Finally, we also need to pay attention to the compatibility of Chainwheel & Crank Set. Some Chainwheel & Crank Sets may be designed for specific bicycle brands or models. If you are unsure of their compatibility, it is best to consult a professional or review relevant information before purchasing.
In general, it is very important to carefully inspect the Chainwheel & Crank Set before installation. Not only does this ensure a smooth installation, it also improves the performance and longevity of your bike's drivetrain. Therefore, we should carefully perform these inspection steps before each installation to ensure that the Chainwheel & Crank Set is in optimal condition.