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Many hydraulic disc brakes have a self-adjusting mechanism so as the brake pad wears, the pistons keep the distance from the pad to the disc consistent to maintain the same brake lever throw. Some hydraulic brakes, especially older ones, and most mechanical discs have manual controls to adjust the pad-to-rotor gap.
Bike disc brakes may range from simple, mechanical (cable) systems, to expensive and powerful, multi-piston hydraulic disc systems, commonly used on downhill racing bikes. Improved technology has seen the creation of vented discs for use on mountain bikes , similar to those on cars, introduced to help avoid heat fade on fast alpine descents.
Some mountain bicycles feature various types of suspension systems (e.g. coiled spring, air or gas shock), and hydraulic or mechanical-disc brakes. Mountain bicycle gearing is often very wide-ranging, from very low ratios to mid ratios, typically with 9 to 28 gears, although some riders prefer the mechanical simplicity and ease of maintenance ...
US 2746575 Disc brakes for road and other vehicles. Kinchin 1956-05-22; US 2591793 Device for adjusting the return travel of fluid actuated means. Dubois 1952-04-08; US 2544849 Hydraulic brake automatic adjuster. Martin 1951-03-13; US 2485032 Brake apparatus. Bryant 1949-10-08; US 2466990 Single disk brake. Johnson Wade C, Trishman Harry A ...
Disc brakes do not allow heat to build up in the tires on long descents; instead, heat builds up in the rotor, which can become extremely hot. There are two different kinds of disc brakes: hydraulic, which uses oil in the lines to push the brake pads against the rotors to stop the bike. They cost more but work better.
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 .