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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 Folding Bike Single Chainwheel & Crank Set
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM Folding Bike Single Chainwheel & Crank Set Supplier and ODM Folding Bike Single Chainwheel & Crank Set 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 choose Folding Bike Single Chainwheel & Crank Set or Multi-Crank Set based on personal needs?

When choosing a Folding Bike Single Chainwheel & Crank Set or a multi-chainwheel system based on your personal needs, you can consider the following aspects:
1. Cycling environment and road conditions:
If your riding is mainly focused on flat city roads or sidewalks and you don’t need to deal with frequent gradient changes, then the Folding Bike Single Chainwheel & Crank Set may be a suitable choice. It's simple, lightweight and strong enough for daily commuting or light leisure riding.
If you often need to ride in mountains, hills, or a variety of road conditions, then a multi-chainring system may be more suitable for you. The multi-sprocket system can provide a wider transmission range through different gear combinations, helping you easily cope with the challenges of different slopes and road conditions.
2. Purpose and frequency of riding:
If you only ride occasionally, or use your folding bike primarily for short commutes and light exercise, the Single Chainwheel & Crank Set may better suit your needs. It is simple and practical, has low maintenance cost and is suitable for low-frequency or light cyclists.
If you are a cyclist who regularly does long distance rides, fitness rides, or outdoor adventures, then a multi-chainring system may be more suitable for you. It can provide more flexible shifting options according to your riding needs, improving riding comfort and efficiency.
3. Budget and cost considerations:
Generally speaking, the price of Folding Bike Single Chainwheel & Crank Set is relatively low and suitable for consumers with limited budget. Its simple structure also means lower maintenance costs.
Multi-sprocket systems are generally more expensive because they contain more components and a more complex shifting mechanism. However, given the wider gear range and improved performance it offers, this may be an option worth investing in for those who ride frequently or are looking for a better riding experience.
4. Personal preference and style:
Some may prefer a simpler, lighter bike design and feel it better suits their aesthetic and riding style. In this case, Single Chainwheel & Crank Set may be a more suitable choice.
On the other hand, if you value flexibility and versatility when riding and like to be able to adjust the speed according to different road conditions and riding needs, then a multi-chainring system may be more in line with your expectations.
Therefore, the choice of Folding Bike Single Chainwheel & Crank Set or multi-chainwheel system should be comprehensively considered based on personal riding environment, riding purpose, budget and personal preference. The system you ultimately choose should meet your riding needs, provide a comfortable ride, and fit within your budget constraints.