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

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Bottom Bracket Sets Factory
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Bottom Bracket Sets Manufacturer

The centre column is the middle part of the bicycle, located between the footpegs and the rear wheel, and is one of the core components of the bicycle. It not only supports the weight of the whole bicycle, but also transmits the force generated by the footpegs to the rear wheel, so that the bicycle generates forward momentum.
There are many types of centre shafts, the common ones are square bore centre shafts, spline centre shafts, one piece centre shafts and so on. Square bore centre shafts are the most common, they are highly versatile and interchangeable and are easy to maintain and replace. Splined centre shafts offer better rigidity and durability and are suitable for higher end bikes. One-piece centre shafts are designed for lighter weight, with less bulk and weight, but are also relatively expensive.
A centre shaft is an important part of your bike and needs to be installed and maintained correctly to ensure proper operation and longevity.
Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Tongkin Technology Co., Ltd. is a China Bottom Bracket Sets Manufacturer and Bottom Bracket Sets 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.


Bottom Bracket Sets Industry knowledge

How to choose the appropriate Bottom Bracket Sets based on their performance characteristics?

Choosing the right Bottom Bracket Sets requires considering a number of performance features to ensure it's the right fit for your bike type, usage needs and personal preferences. Here are some key performance characteristics and their impact in the selection process:
Compatibility and specifications:
First, make sure the Bottom Bracket Sets you choose are compatible with your bike type (e.g. mountain bike, road bike, folding bike, etc.) and bottom bracket size.
Pay attention to the different thread types (such as UK and US) and widths to ensure that the components you choose match the frame.
Bearing type and quantity:
Bearing type (such as steel bearings, ceramic bearings, etc.) and quantity affect rotation smoothness and durability.
High-end bearings generally rotate more smoothly, but are correspondingly more expensive.
Good sealing performance prevents dust, moisture and other contaminants from entering the bottom bracket, extending the service life.
Choose Bottom Bracket Sets with an effective sealing design to reduce maintenance frequency.
For cyclists who pursue lightweight, choosing lightweight Bottom Bracket Sets can help improve the performance of the entire bike.
Note that lightweight components may compromise durability, a trade-off that needs to be weighed.
Durability depends on material selection, manufacturing process, and conditions of use.
Choose Bottom Bracket Sets from well-known brands and made of high-quality materials, which usually have better durability.
Maintenance and replacement:
Consider Bottom Bracket Sets for their maintenance convenience, such as easy removal, cleaning and reinstallation.
Understand component replacement intervals and costs so you can replace them when necessary.
Personal preference and budget:
Choose the Bottom Bracket Sets that suits you based on your personal riding style and budget.
High-end components usually have better performance and longer service life, but are more expensive; while economical components are more cost-effective.
Therefore, choosing the right Bottom Bracket Sets requires a comprehensive consideration of compatibility, bearing type, sealing, weight, durability, maintenance and replacement, as well as personal preference and budget. When purchasing, it is recommended to consult a professional bicycle shop or read relevant reviews for more detailed information and recommendations.