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  2. Fixed-gear bicycle - Wikipedia

    en.wikipedia.org/wiki/Fixed-gear_bicycle

    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]

  3. Freestyle fixed gear - Wikipedia

    en.wikipedia.org/wiki/Freestyle_fixed_gear

    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.

  4. Talk:Fixed-gear bicycle - Wikipedia

    en.wikipedia.org/wiki/Talk:Fixed-gear_bicycle

    I'm all for the fixed-gear article speaking of all things with a fixed-gear-ratio.--radiokillplay 14:06, 5 June 2006 (UTC) I'm against a merge, a fixed bike is just a bike without a freewheel, it can be any type of bike, whereas a track is a very specific type of bike, it just happens to have a fixed wheel/gear.

  5. Single-speed bicycle - Wikipedia

    en.wikipedia.org/wiki/Single-speed_bicycle

    A great "on road" gear ratio, for the 26″ wheel, is 42:17, approximately a 2.5:1 ratio and 64.2 gear inches for versatile tour riding. Many British enthusiasts used to tour on 27–inch–wheeled lightweights on a single fixed–gear of 69 inches before multi–speed gearing became universally popular, though this certainly made for tough ...

  6. Sturmey-Archer - Wikipedia

    en.wikipedia.org/wiki/Sturmey-Archer

    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 ...

  7. Electronic gear-shifting system - Wikipedia

    en.wikipedia.org/wiki/Electronic_gear-shifting...

    Finally, the entire 7970 groupset weighs approximately 113 grams (4.0 oz) less than the 7800 it replaces but 68 grams (2.4 oz) more than the new 7900. [17] In 2011 Shimano introduced the Ultegra Di2 [18] electronic gear change set, a cheaper version of the electronic Dura-Ace system. This set seemed to provide an electronic option within reach ...

  8. Micro pitting - Wikipedia

    en.wikipedia.org/wiki/Micro_pitting

    In a normal bearing the surfaces are separated by a layer of oil, this is known as elastohydrodynamic (EHD) lubrication.If the thickness of the EHD film is of the same order of magnitude as the surface roughness, the surface topography is able to interact and cause micro pitting.

  9. General Atomics MQ-1C Gray Eagle - Wikipedia

    en.wikipedia.org/wiki/General_Atomics_MQ-1C_Gray...

    On 2 June 2012, the Gray Eagle reached a record 10,000 successful automatic launch and recoveries with the Automatic Takeoff and Landing System (ATLS). The system also landed with a 26 knot crosswind. By 25 July 2012, the Army's Gray Eagle Block 1 aircraft has accumulated more than 35,000 flight hours since it was first deployed in 2008.