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. Benelux A defunct British maker of derailers . Bidon French term for a water bottle. The Bike Boom was partly related to the Baby Boom, as Boomers were starting to enter adulthood in large numbers. Billet A solid chunk of metal, usually in the form of a slab or a piece of cylindrical stock.