However, the two gears can vary in size to achieve a different gear ratio. An example of this is in a hand drill, where the drive gear is larger than the driven gear. A pillar drill with a rack ...

The Derailleur gear system moves the bicycle chain between different gears on both the crank and rear sprocket gearsets. This is achieved by displacing the chain sideways so that it 'jumps' from one ...

STEVE:But what we're really interested in, is gears of different sizes. So let's have a look at this one. STEVE:This gear has 48 teeth whereas this one has 24. Now, 48 is 2 times 24. So let's see ...