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

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Multiple Bicycle Freewheel Factory
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Multiple Bicycle Freewheel Manufacturery

A bicycle multi-stage spinning flywheel is an important part of a bicycle gearbox, while a multi-stage flywheel is based on a single-stage flywheel with several additional flywheel blades, which are combined with a sprocket on the centre axle to make up a variety of different transfer ratios to change the speed of the bicycle.
These flywheels can be fitted to the right end of the bicycle's rear axle and are held in place by means of a female screw thread. They remain in the same plane as the sprocket and are connected to the sprocket by a chain to form the drive system of the bicycle. On derailleur bikes, the rear flywheel is mostly in the shape of a tower, this is because the tower wheel provides more speeds and gear ratios, thus making riding easier and more efficient.
Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Tongkin Technology Co., Ltd. is a China Multiple Bicycle Freewheel Manufacturery and Multiple Bicycle Freewheel Factory, 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.


Multiple Freewheel Industry knowledge

How does Multiple Freewheel achieve energy conservation and emission reduction? How do its design features reduce resistance during riding, thereby reducing the rider’s physical exertion?

How does Multiple Freewheel achieve energy conservation and emission reduction? How do its design features reduce resistance during riding, thereby reducing the rider’s physical exertion?
As an innovative bicycle technology, Multiple Freewheel's energy-saving and emission-reducing effects are mainly due to its unique design features. These features help reduce resistance during riding, thereby reducing the rider's physical exertion.
First of all, Multiple Freewheel uses advanced materials and processes to make the wheelset lighter and stronger. The lightweight wheel set reduces the overall mass of the bicycle, thereby reducing friction during riding, making riding easier. At the same time, the solid wheel structure can resist the impact of external forces, maintain the stability of the bicycle during driving, and reduce additional resistance caused by bumps.
Secondly, the design of Multiple Freewheel focuses on improving the rotation efficiency of the wheel set. By optimizing the structure and materials of key components such as bearings and gears, the loss of energy during transmission is reduced, allowing the rider's power to be more efficiently converted into bicycle power. This efficient energy conversion reduces unnecessary energy consumption, thereby achieving the goal of energy conservation and emission reduction.
In addition, Multiple Freewheel also adopts an intelligent control system that can automatically adjust the rotation speed and resistance of the wheel set according to the needs of the rider and environmental conditions. When going on flat roads or going downhill, the system can automatically reduce resistance to make the ride smoother; when going uphill or when acceleration is needed, the system can increase resistance to provide sufficient power support. This intelligent adjustment method allows cyclists to maintain the best riding condition in different riding scenarios, reducing the physical exertion caused by frequent adjustments.
Therefore, Multiple Freewheel achieves the goal of energy conservation and emission reduction through design features such as lightweight wheels, efficient energy conversion, and intelligent control systems. It reduces the resistance during riding, reduces the rider's physical exertion, and makes riding easier and more efficient. With the continuous development and popularization of this technology, we have reason to believe that Multiple Freewheel will play an increasingly important role in the future bicycle market and make greater contributions to environmental protection and people's healthy life.