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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]
Freestyle fixed gear is stunt riding on a fixie. It is an extreme sport where the stunts share elements from BMX , artistic cycling , dirt jumping , and trials . The flat ground style of tricks, similar to artistic cycling , is called Trick-Track or Tarck.
Tricycle gear aircraft are much less liable to 'nose over' as can happen if a taildragger hits a bump or has the brakes heavily applied. In a nose-over, the aircraft's tail rises and the propeller strikes the ground, causing damage. The tricycle layout reduces the possibility of a ground loop, because the main gear lies behind the center of mass.
The Mark-II utilized a standard fixed-gear Velocity XL airframe, modified for rocket propulsion. The Mark-III airframe was more extensively customized during manufacture, explicitly for rocket racing, with a canopy top, center seat and control stick and other enhancements, in addition to the rocket propulsion added to the Mark-II.
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 ...
Models of Gerber fixed blade knives include: the Gerber Guardian: A boot knife designed by knife maker Bob Loveless more than twenty years ago. [3] the Gerber Mark II: A fighting knife. [3] the Gerber BMF : A survival knife. [3] the Gerber LMF II Infantry; the Gerber 31-001901 Bear Grylls Ultimate Pro; the Gerber 22-41121 Prodigy Survival Knife
There are several different types of flip flop hubs available for different applications. Their main purpose is to allow changing between two (and only two) different gear ratios on one rear wheel without the added complications of a multi-gear derailleur or internal hub gear, or between fixed and freewheel options. By removing the rear wheel ...
The difference between pitting and micropitting is the size of the pits after surface fatigue.Pits formed by micropitting are approximately 10–20 μm in depth, and to the unaided eye, micropitting appears dull, etched or stained, with patches of gray. [2]
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