The rear axle components are installed on the flat fork mouth of the frame, which is connected to the rear wheels through the vehicle strip.
Structurally, the front and rear axle components are very similar, with the rear axle component only having an additional set of chain adjustment devices, including chain adjustment screws, chain adjustment screw covers, and chain adjustment nuts.
The chain adjustment screws are installed on the left and right sides of the rear axle rod, and the chain adjustment screw cover is installed at the end of the frame fork mouth. By tightening or loosening the chain adjustment nut, the rear axle rod can move backward or forward on the frame fork mouth, changing the distance between the center of the sprocket and the center of the flywheel, thereby tightening or loosening the chain.
Lightweight bicycles do not have a chain adjustment device. They adjust the tension of the chain by installing the rear axle rod at different positions on the crab claw mouth.
Although the front and rear axle components are similar, the specifications and sizes of the parts are different.
The rear axle stick only has one specification of M10 × 1, which is longer than the front axle stick. The length of the rear axle rod varies depending on its purpose. The rear axle tube and left and right flower plates are also pressed together using a press, collectively known as the rear axle body. The rear axle pipes are generally made of steel pipes with a diameter of 17-20 millimeters and a thickness of 2-2.5 millimeters.
The left and right flower discs of the rear axle components are different. The right end of the right flower disk has an M15 × 1 thread, which is used to install flywheel components. Generally, there are no threads on the left flower disc, only on bicycles equipped with brake pads, the left end of the left flower disc has M15 × 1 threads for installing brake pads. The thickness of the left and right flower discs is about 2.5 millimeters, and 20 spoke holes are evenly distributed around each disc. The diameter of the spoke hole on the flower plate is similar to that of the front axle, with many different sizes and specifications. The maximum diameter of the rear axle spoke hole of the heavy-duty car is 3.9mm, which is used to install the 10th spoke.
The spoke hole on the right flower plate of many bicycles is in the shape of a waist flower. The waist shaped hole is composed of two spoke holes and a large hole. The flywheel component is installed on the right disc, which precisely blocks the spoke hole. If the spoke hole is circular, then after the spoke is damaged, the rear wheel and flywheel components must be removed before replacing with a new one. However, if there is a waist shaped hole on the right flower plate, it is very convenient to replace the spoke with a new one. There is no need to remove the rear wheel and flywheel, as long as the large end of the spoke is first inserted into the middle large hole, and then the "neck" of the spoke is pulled towards the small hole, and the spoke is "inserted" properly.
Like the front axle components, the spoke holes on the left and right flower plates are offset by half a hole distance from each other, so that the length of the car strip is equal.
The rear axle bowl is also installed in the left and right flower plates using a press, and it rotates together with the rear axle body.
There are also two types of rear axle guards: rear axle guards without dust guard edges and rear axle guards with dust guard edges.
The steel balls used in the rolling bearings of the rear axle have two diameters of 6mm and 6.35mm. Some rear axle components are equipped with 18 or 20 loose steel balls (9 or 10 loose steel balls each in the left and right steel bowls); Some rear platinum components are equipped with ball racks, with 6 steel balls on each side of the ball rack.
If the thread specifications of the front and rear axles are both M10 × 1, then the axle bowls, steel balls, and axle stops of the front and rear axle components are identical and can be interchanged.
The above is my answer to the rear axle of the bicycle. If you have a purchasing need for bicycle accessories, please feel free to contact our online customer service or send an email. Customer service will answer your question as soon as possible. Website: https://www.hubs-sf.com Our company is a well-known supplier and manufacturer in the industry. We mainly produce 5 series of products, including bicycle axle covers, flywheels, brakes, bowl covers, and center axles.
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