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

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OEM/ODM Shifter Transmission Group Set Series
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM Shifter Transmission Group Set Series Supplier and ODM Shifter Transmission Group Set Series company 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.

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Industry Knowledge Extension

How to check the integrity of related components before installing Shifter Transmission Group Set Series?

Before installing the Shifter Transmission Group Set Series, it is a very important step to check the integrity of related parts to ensure the smooth progress of the installation process and the reliability of subsequent use. Here are some recommended steps and considerations:
Visual inspection:
Carefully observe the appearance of the component and check for obvious cracks, deformation, wear or corrosion.
Pay attention to check the interfaces and connections of the components to ensure there is no damage or abnormality.
Size and fit checks:
Use measuring tools (such as calipers, micrometers, etc.) to check critical dimensions of components to ensure compliance with product specifications.
Check the fit gaps between components to ensure there is no fit that is too large or too small, which could affect the quality and performance of the installation.
function test:
For some movable parts, such as shift levers, shift forks, etc., simple functional tests can be performed to check whether their movements are flexible and smooth.
For key components such as bearings and gears, you can check whether they rotate smoothly and whether there are any abnormal noises or stagnation.
Surface quality inspection:
Check the surface treatment of the components, such as coating, anti-rust treatment, etc., to ensure that there are no peeling, rust, etc. problems.
For parts that need lubrication, check whether the lubricating grease is sufficient and clean.
Checklist:
According to the product list or manual, check whether all parts are complete and nothing is missing.
For special parts or wearing parts, pay attention to check their identification and batch information to ensure that they meet the usage requirements.
Use professional tools:
During the inspection process, professional tools and instruments are used to improve the accuracy and reliability of the inspection.
If any abnormal or damaged parts are found during the inspection, the supplier or manufacturer should be contacted promptly for replacement or repair. Ensuring that all components are in good condition is an important prerequisite for ensuring the quality and performance of the Shifter Transmission Group Set Series installation. At the same time, it is recommended to read the product manual and installation guide carefully again before installation to ensure a full understanding of the installation process and precautions.