There are also bearings in brakes, pedals and freewheels . Bearing ball A steel ball that is part of a ball bearing assembly. Bearing balls are made in batches, and within a batch the size is very carefully controlled. From one batch to another, however, there can be a considerable variation in actual size of balls of the same nominal size. For this reason, balls from different batches should never be mixed in the same bearing .
Bearing balls come in several quality grades, designated by numbers.
Grade 25 is the best that is available for bicycle applications. Bell Crank A linkage in the form of a right-angled lever, with the pivot at the corner. Bendix A very old company, originally known as a maker of coaster brakes, but later diversified into the automotive industry, where they are particularly involved with starters. The company is still going strong, but the bicycle division was sold off some years ago. Benelux A defunct British maker of derailers .