On a bike, there are several wheels at the chain transmission's level and several gear wheels at the back wheel's level.
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We choose to go by bike with the 22 cog front chain wheel and the 12 cog gear wheel. When the pedals have done a complete turn, the wheel has also done
a turn, because it is interdependant with the chain transmission. So, the chain has 22 links.
The gear wheel has done
1
+ 10/12 turns (22 cogs = 12 cogs + 10 cogs).
That is 1 + 5/6 turns. The back wheel has done 1 + 5/6 turns
because it is interdependant with the gear wheel.
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