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

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OEM/ODM 3x7S Bicycle Trigger Shifter
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM 3x7S Bicycle Trigger Shifter Supplier and ODM 3x7S Bicycle Trigger Shifter 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.


Industry Knowledge Extension

How to solve the problem of Bicycle Trigger Shifter when the chain skips teeth or gets stuck?

Problems related to the Bicycle Trigger Shifter (throttle shifter) when the bicycle chain skips teeth or gets stuck can be solved by following these steps:
First, you should stop riding and check the chain position to determine the exact problem. If the chain is too loose, it may be that the chain and the gear are not properly matched. At this time, a section of the chain can be appropriately cut off to appropriately tighten the chain to ensure a good match with the gear.
Secondly, if the chain or sprocket is severely worn, this may cause the chain to not lock tightly when it is clamped into the sprocket, and the teeth may jump easily when force is exerted. In this case, it is necessary to replace the new chain or sprocket according to the actual situation.
In addition, severe overloading can also cause the chain to skip teeth. Since the chain cannot withstand excessive loads, it may become extremely tense under overload conditions, resulting in tooth skipping. In order to solve this problem, high-strength chains need to be selected according to the load capacity to meet the load requirements and eliminate the causes of overload.
When solving the problem of a stuck chain, you also need to first stop riding and then carefully move the chain to try to find the stuck location. Sometimes a stuck chain can be freed by gently shaking the chain or rotating the pedal backwards. If the stuck chain is caused by debris or dirt, it can help to carefully remove it using your fingers or a tool. After cleaning, make sure the chain is properly seated on the gears and derailleur, and test the chain to make sure it runs smoothly and is no longer stuck.
At the same time, the Bicycle Trigger Shifter itself also needs to be checked. For example, check whether the transmission cable is bent or broken. If so, you need to replace it with a new one. In addition, check whether the tail hook is deformed. If it is deformed, it needs to be replaced in time. When adjusting the transmission, you can pay attention to adjusting the limit screw and thumb knob to ensure that the chain moves within the correct range and that the transmission cable is moderately tight.
Finally, to reduce the chance of chain jams and skipped teeth, it is recommended to clean the chain regularly and use a specialized bicycle lubricant to keep the chain in good condition. This not only improves the riding experience, but also extends the life of the bike and Bicycle Trigger Shifter.
Please note that the above methods are mainly based on common bicycle problems and solutions. If the problem persists, or you're not sure how to fix it, it's recommended to seek help from a professional bicycle mechanic.