Search results
Results from the WOW.Com Content Network
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]
The larger diameter thread on the fixed side accepts a standard threaded cog and uses the same size threads as the freewheel side of the hub. The most common standard I.S.O. thread size is 1.375" x 24 tpi (threads per inch), but there are other less common older sizes ( British 1.371" x 24 TPI, French 34.7 x 1 mm, Italian 35 mm x 24 TPI).
Track bicycles have only one drive sprocket (or cog) and one chainring, so the size ratio is relevant. A lower gear ratio allows quicker acceleration or 'jump' but can limit top speed. A larger gear ratio makes sustained speed easier, important in pursuit racing, time trial and bunched races such as points or scratch events. Without a good jump ...
One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...
The rotafix enables the securing of a sprocket ("cog") to a track hub without the use of a chain whip. The chain is removed from the chainring and rests around the bottom bracket shell and on the sprocket with the rear wheel in the horizontal track ends. The chain is folded over itself such that the bottom half of the chain is trapped between ...
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 ...
A cogset works with a rear derailleur to provide multiple gear ratios to the rider. Cassettes come in two varieties, freewheels or cassettes, of which cassettes are a newer development. Although cassettes and freewheels perform the same function and look almost the same when installed, they have important mechanical differences and are not ...
While builders initially focused on single-speeds and internal hubs, in early 2009 f8 used a Gates-compatible fixed-gear cog designed by Phil Wood & Co., [10] offering a belt-driven fixed-gear bicycle. In 2009, Wayne Lumpkin, owner of Spot Brand and best known as the founder of Avid, designed a belt system called CenterTrack.