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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.
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 engines range from less than 50 cc (cubic centimetres), commonly found in many small scooters, to 5735 cc, a Chevrolet V8 engine, currently used by Boss Hoss in its cruiser style motorcycle. Motorcycles have mostly, but not exclusively, been produced with one to four cylinders, and designers have tried virtually every imaginable layout.
The Yamaha XV920R is a Japanese motorcycle. It was introduced in 1981, along with the XV750 Virago. In addition to larger engine displacement it featured "standard" styling and technical features, in contrast to the cruiser style of the Virago . This model was geared toward European-style sport touring.
One alternative is a differential, which is the approach used in most cars. A second alternative is to use a pair of ratchets, where the slower wheel is driven and the faster wheel coasts. Rear drive often uses "idler" pulleys to route the chain; front-wheel drive can eliminate idlers, so offers less friction and also less weight.
A feet first (FF) motorcycle is a class of motorcycle design which positions the rider with their feet ahead, like a car, rather than below and astride, as with conventional bikes. As there are other types of motorcycle (e.g. choppers ) that have a 'feet forward' position, an alternative term sometimes used is advanced single track vehicle .
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.
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.