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The mechanism was invented in 1927 by Tullio Campagnolo, an Italian bicycle racer. He was frustrated when he attempted to change gears during a race. At the time there was but one cog on each side of the rear hub, so gear changes necessitated stopping, removing the rear wheel, flipping it over horizontally so that the opposite cog is engaged by the chain, and finally reinstalling the wheel.
Skirt guard or coatguard: a device fitted over the rear wheel of a bicycle to prevent a long skirt, coat or other trailing clothes or luggage from catching in the wheel, or in the gap between the rim and the brakes; Spindle: an axle around which a pedal rotates; threaded at one end to screw into crank arms; Spoke: connects wheel rim to hub ...
The hub assembly is located between the brake drums or discs and the drive axle. A wheel is bolted on it. Depending on the construction, the end of the hub comes equipped with the splined teeth. They mate the teeth on the axle shaft. The axle hub spins along with the wheels bolted to it and provide power to the wheels in order to rotate.
The rear wheel cannot be completely separated from a bicycle with hub gears without also disconnecting the gear cable (and any coaster-brake clamp), which complicates the process of replacing an inner tube (of course, one can still patch an innertube without removing a wheel). The hub gear is an integral part of the wheel and it is not possible ...
A rear hub with left hand threads to accept the LH freewheel. A left side drive crank arm. Although you could simply reverse a normal set of crank arms, the left side and right side specific pedal bosses would be reversed, causing them to tend to come loose and spin out with normal riding.
Since the 1980s, bicycles have adopted standard axle spacing: the hubs of front wheels are generally 100 mm wide fork spacing, road wheels with freehubs generally have a 130 mm wide rear wheel hub. Mountain bikes have adopted a 135 mm rear hub width, [ 4 ] which allows clearance to mount a brake disc on the hub or to decrease the wheel dish for ...
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