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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 Bicycle Single Speed Freewheel
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM Bicycle Single Speed Freewheel Supplier and ODM Bicycle 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 do I clean my Single Speed Freewheel and chain regularly to remove accumulated dirt and grease?

Regularly cleaning your Single Speed Freewheel and chain is an important step in maintaining your bike's performance and extending its life. Accumulated dirt and grease not only affects the smoothness of your ride, it can also cause damage to your cassette and chain. Here's a closer look at how to clean your cassette and chain regularly to ensure they're running well.
First, prepare cleaning tools. You'll need flywheel cleaner, chain cleaner, a clean cloth or brush, chain lube, and possibly old newspaper or plastic sheeting to prevent the floor from getting dirty during the cleaning process.
Next, perform flywheel cleaning. Place the bike in a stable place so that the rear wheel can turn freely. Use flywheel cleaner to spray on the flywheel. Be careful to avoid spraying the cleaner onto the bearings or other parts that do not need to be cleaned. Wait a few minutes for the cleaner to fully dissolve the dirt and grease on the flywheel. Then, wipe the surface of the flywheel with a clean cloth or brush to completely remove dirt and grease. If the dirt on the flywheel is stubborn, you can repeat the steps of spraying cleaner and wiping until the surface of the flywheel is clean.
After cleaning the flywheel, the next step is to clean the chain. Spray chain cleaner evenly over the chain, making sure every link is covered. Wait a few minutes for the cleaner to fully dissolve the dirt and grease on the chain. Then, wipe with a clean cloth or brush in the direction of the chain to remove dirt and grease. Note that you should maintain a certain intensity when cleaning the chain to ensure that deep-seated dirt can be removed.
After cleaning the cassette and chain, the last step is to perform lubrication maintenance. Apply chain lubricant evenly on a clean chain, which will help reduce friction between the chain and the flywheel and improve rotation efficiency. Be careful not to over-apply lubricant to avoid staining other parts or affecting the riding experience.
In addition, there are some things you need to pay attention to during the cleaning process. First, avoid using cleaners or solvents that are too strong to avoid damaging the surface of the flywheel and chain. Secondly, be careful and patient when cleaning to ensure that every part is thoroughly cleaned. Finally, it is very important to clean the cassette and chain regularly. It is recommended to do a simple cleaning after every ride and a deep cleaning every once in a while.
By cleaning your Single Speed Freewheel and chain regularly, you can remove accumulated dirt and grease and keep them running well. This not only improves riding comfort and safety, but also extends the life of the bike. Therefore, cyclists should pay attention to this maintenance task and perform it regularly.