Freewheel

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A freewheel is a set of sprockets of different sizes mounted on the rear hub (rear axle) of a bicycle. Together with the front chainring set, the chain, and the rear derailleur, it forms the bicycle’s drivetrain system. Simply put, the freewheel is the “rear gears.” The rider changes gears by using the derailleur to move the chain across different sprockets on the freewheel, thereby adjusting the gear ratio.
The freewheel provides a wide range of gearing options: sprockets of different sizes—from small to large—offer different transmission ratios. Smaller sprockets are used for higher speeds, flat roads, or downhill riding, while larger sprockets are ideal for climbing, starting from a stop, or riding into headwinds, making pedaling easier.

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Ningbo Shenglu Bicycle Co., Ltd.
Manufacturing Bicycle Components, Built on Process Control
Ningbo Shenglu Bicycle Co., Ltd. is located in Ningbo City, Zhejiang Province, China. Founded in 1998, our company covers an area of 80,000 square meters. We have always adhered to the corporate culture of "People-oriented, Unity and Progress" and the business philosophy of "providing customers with high-quality products and competitive prices".
After more than 20 years of development, we have grown into a professional manufacturing enterprise with a complete production chain and supporting facilities. Our annual production capacity reaches 15 million pairs of steel hubs and 5 million pieces of freewheels. "SHUNFENG", the core brand of Ningbo Shenglu Bicycle Co., Ltd., has gained a good reputation in the industry.
While providing customers with high-quality services, we also attach great importance to improving our manufacturing capacity. We have a complete in-house production chain, including punching, aluminum forging, CNC machining, cold forging, blackening and phosphating, aluminum oxidation, CP and ED plating, heat treatment, and assembly.

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