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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 MTB Kids bike City bike E bike Single Speed Freewheel
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM MTB Kids bike City bike E bike Single Speed Freewheel Supplier and ODM MTB Kids bike City bike E bike Single Speed Freewheel 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 prevent the Single Speed Freewheel and chain from getting wet, rusting and accumulating dust when storing your bicycle?

When storing your bicycle, it is crucial to prevent the Single Speed Freewheel and chain from getting wet, rusting, and accumulating dust, as this directly affects the service life and riding experience of the bicycle. Below we’ll detail some effective measures to help you store your bike properly and protect your cassette and chain from moisture and dust.
First of all, the choice of storage environment is crucial. Choose a dry, ventilated place out of direct sunlight to store your bicycle. Humid conditions can easily cause the flywheel and chain to rust, while direct sunlight can discolor or deform metal parts. Therefore, ensuring that the storage location has these conditions can greatly reduce the risk of the flywheel and chain getting wet and rusting.
Secondly, covering your bike with a dust cover is an effective way to protect your bike from dust. When storing your bicycle, you can use a special bicycle dust cover or a clean cloth to cover the entire bicycle to ensure that the flywheel and chain are not covered by dust. The dust cover can not only block dust, but also prevent the intrusion of moisture to a certain extent.
Additionally, it is equally important to clean your bike regularly. Even if the bike is stored in a good environment, not using the bike for an extended period of time can cause dust to accumulate on the cassette and chain. Therefore, it is recommended to give your bike a complete cleaning every once in a while, including the cassette and chain. Use specialized cleaners and tools to thoroughly remove dirt and grease from the cassette and chain to ensure they remain clean.
For flywheels and chains that have become damp and rusty, timely measures should be taken to deal with them. Mild rust can be removed with a wire brush or a special rust remover, and then a rust inhibitor can be applied to prevent further rust. If the rust is severe, parts may need to be replaced. Therefore, regularly checking the status of the flywheel and chain, and finding and dealing with problems in time are the keys to keeping your bicycle in good condition.
In addition to the above measures, there are some details that need to be paid attention to. For example, make sure the cassette and chain are dry before storing your bike, and avoid placing a wet bike directly into storage. In addition, regularly check the humidity and temperature of the storage location to ensure they remain within the appropriate range.
In short, to avoid the Single Speed Freewheel flywheel and chain from getting wet, rusting and accumulating dust, you need to choose a suitable storage environment, cover it with a dust cover, clean the bicycle regularly and deal with rust problems in a timely manner. By implementing these measures, you can effectively protect your bike from moisture and dust, extend its service life, and enhance your riding experience.