Bicycle BB Cartage

A bicycle BB cartridge refers to the bottom bracket cartridge, which is a sealed unit that houses the bearings and spindle that connect the crankset to the bicycle frame. The bottom bracket (BB) is a critical component of a bicycle's drivetrain system, and the cartridge design makes maintenance and replacement of the bearings easier.

The BB cartridge typically consists of two cups that are threaded into the frame's bottom bracket shell and a spindle that passes through the cups and connects the crankset. The bearings are housed within the cartridge, which is usually made of a sealed plastic or metal shell. The sealed design helps to keep dirt, dust, and moisture out of the bearings, extending their lifespan and reducing the need for maintenance.

When the bearings in a BB cartridge wear out or become damaged, the entire cartridge unit can be replaced, rather than attempting to service or replace individual bearings. This can make maintenance easier and more convenient, particularly for cyclists who may not have specialized tools or experience working on bottom brackets.

When selecting a replacement BB cartridge, it is important to choose one that is compatible with the specific bicycle frame and crankset being used, and to properly install and torque the cartridge to the manufacturer's specifications. This can help ensure optimal performance and longevity of the bottom bracket and drivetrain system.