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A Park Tool bicycle work stand. The founders of Park Tool along with James E. Johnson developed a clamping device on their original bike repair stand, for which they received a United States Patent in 1976. [3] The company has applied for and has been granted many patents since then, including a pizza cutter shaped like a penny-farthing.
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.
All Sturmey-Archer gear hubs use epicyclic (planetary) geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple ...
Howard Carl Hawkins (1932 – January 26, 2015) was an American businessman and bicycle tools maker, co-founder of Park Tool in Saint Paul, Minnesota. He is considered one of the pioneers in the bicycle industry. He died of a heart attack in Arizona on January 26, 2015.
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Spin disks are usually a flat round disk, commonly of plastic, with a square hole in the middle to fit over the socket wrench's male adapter plug. The edges are grooved for a solid grip. Using the spin disk will be much quicker than using the socket wrench's handle, especially if its range of motion is limited.