Conversely a high gear provides a higher bicycle speed, but more torque is required to turn the crank arm of the pedal. One can use a low gear that allows one to pedal easily up hill, but with a lower bicycle speed. A classical example is the gears on a bicycle. A Gear Ratio can increase the output torque or output speed of a mechanism, but not both. The Power Transmission often includes a Gear Ratio or Mechanical Advantage. ![]() Examples of Power Transmission elements include: gears, friction drives, timing belts, flat belts, levers, and screw drives. ![]() In machine design one often needs to incorporate a Power Transmission between an energy source and the desired output motion.
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