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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 3S Bicycle Front Derailleur
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM 3S Bicycle Front Derailleur Supplier and ODM 3S Bicycle Front Derailleur 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 can I tell if my Bicycle Front Derailleur is broken, bent, or otherwise damaged?

Determining whether the Bicycle Front Derailleur is broken, bent or otherwise damaged is a process involving careful observation and empirical judgment. Here are a few key steps and considerations to help you make an accurate assessment:
First, observe the appearance of the Bicycle Front Derailleur. Stand in front of the bike and take a close look at the overall structure of the front derailleur. Pay attention to check for any obvious cracks or broken parts, which usually occur when subjected to impact or excessive stress. Also, watch to see if the shape of the front derailleur remains straight; if it appears bent or twisted, it could be a sign of damage.
Secondly, check the fixed parts of the front derailleur. The front derailleur is usually attached to the bicycle's front fork with screws or clips. Check whether these fixed parts are loose or damaged. If the screws are found to be loose or the buckles are broken, this may cause the front derailleur to become unstable or shift, thereby affecting the shifting effect.
Next, check the moving parts of the front derailleur. The front derailleur contains moving parts such as springs and levers, which are responsible for controlling the chain's switching between different gears. Observe whether these parts work smoothly and are not stuck or malfunctioning. At the same time, check whether the spring is loose or deformed, and whether the lever is intact and can be operated flexibly.
Also, consider the age of the front derailleur and the riding environment. If you ride on bumpy roads for long periods of time, or perform frequent heavy shifting operations, the front derailleur may be more susceptible to damage. Understanding usage and environment can help you more accurately determine the condition of your front derailleur.
Finally, if you have any doubts about the condition of your front derailleur, it's best to seek the advice of a professional bicycle repair technician. They have extensive experience and professional tools to provide you with more accurate assessments and repair recommendations.
In short, judging whether the Bicycle Front Derailleur is broken, bent or otherwise damaged requires comprehensive consideration of appearance, fixed parts, moving parts, usage and environment. Through careful observation and empirical judgment, you can better understand the status of the front derailleur and take necessary repair measures in a timely manner.