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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.
Pedal spindles are hard steel, and gradually fret and erode the crankarm where the two meet. This can eventually be a cause of crank breakage, which commonly occurs at the pedal eye. Some manufacturers advise the use of a thin steel washer between the pedal and crank, but this is ineffective because the hard washer frets against the crank instead.
An attribute of the penny-farthing is that the rider sits above the front axle. When the wheel strikes rocks and ruts, or under hard braking, the rider can be pitched forward off the bicycle head-first. Headers were relatively common and a significant, sometimes fatal, hazard.
Aerozine ceramic external bottom bracket bearing cups for BSC/ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom bracket shell. The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely.
Specialized Bicycle Components, Inc., colloquially known as and stylized as SPECIALIZED, is an American company that designs, manufactures and markets bicycles, bicycle components and related products under the brand name "Specialized", as well as the premium and professional oriented "S-works".
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