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The cranks are the main component difference between road and time-trial bikes. A standard crank, which is found on road bike, has two chain-rings and a gearing of 53×39, which means that the large chain-ring has 53 teeth on it and the little ring has 39 teeth. The teeth grab the chain and propel the bike forward.
The curb chain is attached to the rings at the end of the cheek, so, as the cheek moves forward, the chain is pulled and tightened in the curb groove. Once it comes in contact with the curb groove of the horse it acts as a fulcrum, causing the cannons of the bit mouthpiece to push down onto the horse's bars, thus amplifying the bit's pressure ...
Others are produced by several manufacturers. Differences may include a wider seat area, shorter nose, and center relief. [23] [24] A banana seat is a long saddle, usually supported at both ends, popular on wheelie bikes. [25] The rider can choose where they sit on it. It is sometimes used to carry a passenger.
The fixed length between bottom bracket and rear axle gives the URT the advantage of zero chain growth and consistent front derailleur shifting. Additionally the bike is easily modified into a single-speed. However, as the URT's suspension moves, the distance between seat and pedals changes, detracting from pedaling efficiency.
With a chain drive transmission, a chainring attached to a crank drives the chain, which in turn rotates the rear wheel via the rear sprocket(s) (cassette or freewheel). There are four gearing options: two-speed hub gear integrated with chain ring, up to 3 chain rings, up to 12 sprockets, hub gear built into rear wheel (3-speed to 14-speed).
Chainrings (also called "chain rings", [11] "chainwheels" or "sprockets", although sprocket is used this way mostly in the BMX community [3]) engage the chain to transfer power to the (usually rear) wheel. They usually have teeth spaced to engage every link of the chain as it passes over; however, in the past, some designs (called skip-tooth or ...
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A flat bar is a nearly-straight tube, in most cases slightly bent toward the rider. Many penny-farthings and early safety bicycles had flat handlebars. The angle between the slightly swept-back ends of the handlebar and the axis of the stem clamp is known as the sweep angle.
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