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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

Shifter Transmission Group Set Series What should I pay attention to when storing transmissions for a long time?

When a Shifter Transmission Group Set Series transmission requires long-term storage, to ensure its performance and longevity are not affected, the following key points need to be noted:
Cleanliness:
Before storing, make sure the transmission is thoroughly clean and free of oil, dust, and other impurities. This helps prevent corrosion and contamination during storage.
Oil treatment:
Determine whether to drain the transmission fluid based on the manufacturer's recommendations. If you decide to drain, the old oil should be collected in a suitable container and disposed of in accordance with environmental regulations. If you decide to retain the oil, make sure it is in good condition and check that the oil seal and drain port are well sealed to prevent leakage.
Sealing and moisture-proofing:
Completely cover the transmission with appropriate sealing material or packaging to prevent dust, moisture, and other contaminants from entering. Pay special attention to sealing all interfaces, connectors and openings to ensure they are protected from the outside environment.
Avoid extreme temperatures:
When storing the transmission for a long period of time, it should be stored in an environment with appropriate temperature and humidity. Avoid exposure to high or low temperatures or extreme changes in humidity, which may cause damage or deformation of internal components of the transmission.
Periodic inspection:
Even if the transmission is in storage, its condition should be checked regularly. Check that the seal is intact and there are no signs of leakage or damage. If problems are found, prompt measures should be taken to repair or replace them.
Records and maintenance:
Document any inspection, maintenance or repair activities during storage. This helps track the condition of the transmission and provides reference information if needed.
Preparation before use again:
Detailed inspection and maintenance should be performed before the transmission is prepared to be returned to service. This may include changing fluids, cleaning internal components, checking sensor and actuator functionality, etc. Make sure the transmission is in good condition and meets the manufacturer's operating requirements.
Please note that the above recommendations are general guidelines. Specific storage requirements may vary depending on the transmission model, manufacturer and usage environment. Therefore, before storing a Shifter Transmission Group Set Series transmission, it is recommended to consult the relevant technical manual or consult the manufacturer for more detailed and accurate guidance.