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Sprockets, also called fixed gears or cogs, are essential components of the drivetrain of fixed gear track bikes. Here is a description of their function, their characteristics, the standards and the different types of sprockets for track bikes:
Function :
1. Power transfer:
The sprockets are mounted on the rear wheel hub and directly receive the pedaling force of the rider, thereby transferring power to the wheels to move the bicycle forward.
2. Determination of transmission ratio:
Sprockets are available in different tooth sizes, allowing the rider to choose the right gear ratio for their strength and riding preferences.
Features :
1. Number of teeth:
Sprockets come in a range of tooth sizes, typically 13 to 18 teeth, although more extreme sizes may be available. A sprocket with fewer teeth will provide a higher speed but require more effort to pedal, while a sprocket with more teeth will provide a lower speed but require less effort.
2. Thread:
Sprockets can be threaded or unthreaded. Threaded sprockets are screwed onto the standard thread of the rear wheel hub, while unthreaded sprockets require the use of a lock nut to secure them in place.
Standards:
1. Thread pitch:
Threaded sprockets are generally available in a standard thread pitch of 1.37" x 24 TPI (threads per inch), although other thread pitches may be used in some applications.
2. Hub Compatibility:
The sprockets must be compatible with the rear wheel hub. Some hubs have specific threads for threaded sprockets, while others require the use of a different fastening system, such as a keyway locking system.
Different types of sprockets for track bikes:
1. Fixed gears:
These sprockets are attached directly to the rear wheel hub and rotate with the wheel. They are used in fixed gear configurations, where the rider can stop the rotation of the pedals by braking or resisting the pedaling motion.
2. Freewheels:
Although less common on track bikes, some riders may choose to use freewheels, which allow the rider to coast without causing the pedals to rotate. These sprockets are generally used with a traditional braking system.
In summary, track bike sprockets are essential parts of the drivetrain, allowing the rider to transfer their pedaling power to the wheels. With specific features such as tooth count, thread and mounting type, as well as manufacturing standards, they contribute significantly to the rider's performance and riding experience on the track.