The forks are the part of a bicycle that secures the front wheel.Derailleurs are used to shift the chain from one sprocket to another.
The derailleurs are the variable ratio bicycle gearing arrangement including a chain, various sprockets of diverse sizes. The cranks are the part of a bike drivetrain that turns the reciprocating motion of the riders legs into rotational movement used to pressure the chain or belt, which in turn pushes the rear wheel. A spring tool on the pedal enables you to clip the cleats on shoes in and out of the pedals. The cleats attach to the bottom of the cycling shoe. Most bike chains are constructed from plain carbon or alloy iron. The chains are the roller chains that convey power from the pedals to the drive wheel of a bike, thus driving it. A standard road bike may utilize 53t large chainrings. The chainrings are the rounded, spiky bit associated with your cranks that pull the chain around. The cassettes are the bunch of sprockets positioned on the rear core of your bike, slotting onto a freehub body and kept securely in place with threaded cassette lockring. As pressure is raised at the brakes the friction force is raised. The brakes decrease the speed of a bike or stop it from moving. 
The bottom brackets allow the crankset to turn easily. The bottom brackets on a bike connect the crankset to the bike.You can buy bottle cages from Garmin, Shimano, Sram, Specialized, Ergon, Elite, Tacx, Mavic, Brooks England, Rotor. Bottle cages hold a water bottle tightly on your bike. The bottle cages do specifically what they say on the bottle.
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