External Bearings
.jpg)
.jpg)
External crank bearings can be seen outside the frame
External crank bearings are an important part of the bike that connect the cranks to the frame and ensure that the power from the pedals is transferred to the chain and wheels. These bearings are mounted on the outside of the bike frame and are visible when looking at the crank of the bike.
The function of external crank bearings
External crank bearings are designed to give cyclists a more efficient and reliable way to transfer power from the pedals to the chain. They are usually made from high-quality materials that are able to withstand the high pressure and repetitive motion they are subjected to during cycling.
How do external crank bearings work?
External crank bearings consist of two bearing housings that are mounted on the outside of the bike frame. These bearing housings contain ball bearings that ensure smooth and friction-free movement of the cranks. Some external crank bearings also have seals or protective rings that prevent dirt and debris from entering the bearings and causing wear or damage.
Types of external crane bearings
There are several different types of external crane bearings, including press-fit and threaded crane bearings. Press-fit crane bearings are mounted directly into the bottom bracket without the need for threads, while threaded crane bearings require a threaded bottom bracket. There are also different standards for external crank bearings, including BB30, GXP and Shimano Hollowtech II. The external bearings are the same as threaded crank bearings.
Maintenance of external crank bearings
To ensure a long lifespan and optimal performance of external crank bearings, it's important to perform regular maintenance. This can include cleaning and lubricating bearings, replacing damaged or worn parts, and adjusting crane bearings to ensure proper fit and alignment.
In summary, external crank bearings are an important part of the bike, playing a crucial role in transferring the power from the cranks to the chain and wheels. There are several different types and standards of external crank bearings and it's important to perform regular maintenance to ensure longevity and optimal performance.