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the front and rear shift pattern on a bike with multiple chainrings can be programmed to make best use of the gear progression, avoid duplicate ratios and relieve the rider of the need to decide what combination of front and rear sprockets to employ; the smoothness of electronics can reduce the shock on drivetrain components [5]
To change gear: stop, remove the rear wheel, flip it over, replace the wheel, adjust chain tension, resume cycling. Current double sided wheels typically have a fixed sprocket on one side and a freewheel sprocket on the other. Prior to 1937 this was the only permitted form of gear changing on the Tour de France. [16]
A relatively simple design of differential is used in rear-wheel drive vehicles, whereby a ring gear is driven by a pinion gear connected to the transmission. The functions of this design are to change the axis of rotation by 90 degrees (from the propshaft to the half-shafts) and provide a reduction in the gear ratio .
Distinguishing it from the GM 14-bolt 9.5-inch ring gear rear differential is the latter's utilization of C-clips to retain axles, differing from the free-floating axle mechanism of its heavy-duty counterpart.
Gain and Watts Calculator; Mike Sherman's gear calculator Archived 2011-03-10 at the Wayback Machine Online calculator for derailleur gears, with useful graphic displays; HPV Drivetrain Analyzer A drivetrain analyzer and gear calculator for HPV's (Human Powered Vehicles) that will handle compound drives and geared cranks and hubs.
In road racing, the swiftest gear changes are required on the sprints to the finish line. Therefore high-normal types, which allow a quick change to a higher gear, remain the preference. [citation needed] Low normal or rapid rise rear derailleurs return the chain to the largest sprocket on the cassette when no cable tension is applied.
A hub gear, [1] internal-gear hub, [2] internally geared hub [3] or just gear hub [4] is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed ...
A track bicycle or track bike is a form of fixed-gear bicycle optimized for racing at a velodrome or at an outdoor track. Some road racing and club cyclists use a fixed-gear bicycle for training during the winter months, generally using a relatively low gear ratio, believed to help develop a good pedalling style. [5]