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With a one-piece (also called Ashtabula) crank and bottom bracket, the spindle and crank arms are a single piece. The bottom bracket shell is large to accommodate removal of this S-shaped crank. Bearing cups are pressed into the bottom bracket shell. The crank holds the cones, facing in; adjustment is made via the left-threaded non-drive side cone.
U-brake on a freestyle BMX bike. U-brakes (also known by the trademarked term 990-style) are essentially the same design as the centre-pull caliper brake. The difference is that the two arm pivots attach directly to the frame or fork while those of the centre-pull caliper brake attach to an integral bridge frame that mounts to the frame or fork ...
Bicycle brake cable: see Cable; Bottle cage: a holder for a water bottle; Bottom bracket: The bearing system that the pedals (and cranks) rotate around. Contains a spindle to which the crankset is attached and the bearings themselves. There is a bearing surface on the spindle, and on each of the cups that thread into the frame.
Crank length is measured from the center of the pedal spindle to the center of the bottom bracket spindle or axle. The larger bicycle component manufacturers typically offer crank lengths for adult riders from 165 to 180 mm (6.5 to 7.1 in) long in 2.5 mm (0.098 in) increments, with 170 mm (6.7 in) cranks being the most common size.
Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios .
MAFAC, or Manufacture Arvernoise de Freins et Accessoires pour Cycles (Arveni Manufacturing Works for Bicycle Brakes and Accessories), was a French manufacturer of bicycle brakes and tool kits. MAFAC was founded in post-war France under the name "Securité", which changed to MAFAC in the Autumn of 1947.
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Once the brake pads make contact with the rear wheel, the Slidepad slides forward, which pulls a cable that is connected to the front brakes. [1] Similar to the anti-lock brake system in cars, the mechanism prevents the front wheel from locking, no matter how hard the brake is pressed or how slippery the road conditions are.
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