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A gear case, also known as a chain case or chainguard, is an enclosure for the bicycle chain and sprocket assemblages commonly employed by utility bicycles. It serves to protect the cyclist from being soiled or trapped in the chain rings and tends to fully enclose the drive train. It may also contain an oil bath to keep the chain lubricated.
A motorcycle fork is the portion of a motorcycle that holds the front wheel and allows one to steer. For handling, the front fork is the most critical part of a motorcycle. The combination of rake and trail determines how stable the motorcycle is. The 'fork' on a motorcycle consists of multiple components.
BMW C1. A cabin motorcycle is a fully or semi-enclosed motorcycle. [1] They first appeared in the 1920s [1] In parts of Eastern Europe, they are known as dalniks.. These fully enclosed non-production motorcycles used for land-speed record-breaking attempts, such as the NSU Delphin III, are known as streamliners.
Motorcycle carrying trailers may be open or enclosed. They may be wide, for two machines side-by-side, or narrow, for just a single machine. The main features that distinguish them from other flatbed or enclosed trailers are track(s) to keep the wheels from sliding side to side and sufficient tiedown points to keep the motorcycle(s) from tipping.
Before epicyclic gears were used in bicycle hubs, they were used on tricycles. Patents for epicyclic hubs date from the mid-1880s. [5] [6] The first patent for a compact epicyclic hub gear was granted in 1895 to the American machinist Seward Thomas Johnson of Noblesville, Indiana, U.S.A. [7] This was a 2-speed but was not commercially successful.
Chain drive was the main feature which differentiated the safety bicycle introduced in 1885, with its two equal-sized wheels, from the direct-drive penny-farthing or "high wheeler" type of bicycle. The popularity of the chain-driven safety bicycle brought about the demise of the penny-farthing, and is still a basic feature of bicycle design today.