A good toothed belt; timing belt; cogged belt; cog belt; or synchronous belt can be a flexible belt with teeth moulded onto its inner surface. It is designed to run over matching toothed pulleys or sprockets . Toothed belts 
are used in several in mechanical gadgets, where high-power transmission is desired.
Toothed belts are utilized widely in mechanical gadgets, which includes sewing machines ,photocopiers and many others. A major use of toothed belts is as the timing belt used to operate a vehicle the camshafts in a vehicle or motorcycle engine.
As toothed belts can deliver more power than a friction-drive belt, they are utilized for high-power transmissions. These include the primary drive of some motorcycles , notably later on Harley-Davidsons ;and the supercharger used for dragsters .
Microlight aircraft driven by high-speed two-stroke engines such as the Rotax 532 use toothed belt reduction drives to allow the use of a quieter and better slower-quickness propeller. Some amateur-built airplanes run by automotive engines make use of cog belt reduction drive units.
A good tooth pulley has some teeth whereas a set belt pulley doesn’t have any teeth.
The tooth pulley is used when accurate transmission of the torque is necessary. Flat belt pulleys or V-belt pulleys cannot deliver 100% accurate tranny of the torque because there’s always some (very little – but nonetheless) slipping between your pulley and belt.
TOOTHED PULLEY / TIMING BELT
Ever-power pulleys that specialize in engagement transmission
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