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Shimano’s 105 Di2 components carry R7170 (STI levers) and R7150 (derailleurs) series numbers. ... history would suggest that the R7120 STI levers are for mechanical shift/hydraulic disc, and the ...
Shimano 105 9-speed STI levers. In 2003, Shimano introduced "dual-control levers" or STI for mountain bikes in their XTR groupset. Like the road shifters, XTR used the same lever for braking and shifting. This was met with some resistance as they limited the choice of disc brakes to only those made by Shimano.
Shimano, Inc. (株式会社シマノ, Kabushiki-gaisha Shimano), originally Shimano Iron Works (島野鐵工所) and later Shimano Industries, Inc. (島野工業株式会社), is a Japanese multinational manufacturing company for cycling components, fishing tackle and rowing equipment, which also produced golf supplies until 2005 and snowboarding gear until 2008.
Disc brakes are most common for mountain bikes (including nearly all downhill bikes), and are also seen on some hybrid bicycles and touring bicycles. Towards the end of the 2010s, disc brakes have become increasingly common also on racing bicycles. [28] A disc brake is sometimes employed as a drag brake for controlled speed reduction on steep ...
On automobiles, disc brakes are often located within the wheel A drilled motorcycle brake disc. The development of disc-type brakes began in England in the 1890s. In 1902, the Lanchester Motor Company designed brakes that looked and operated similarly to a modern disc-brake system even though the disc was thin and a cable activated the brake pad. [4]
The design only allowed for a single front disc brake so a comparatively large 330 mm disc was mated to a six-piston caliper, a world first on a production bike. [ 9 ] : 28 The traditional axial caliper mount began to be unreliable when slick tires were introduced, so motorcycles began adopting radially mounted calipers from Formula One car racing.