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gears & shifting
Gears help you keep good leverage (mechanical advantage) through a range of speeds as you cycle.
Shifters control the gears to change leverage as needed.
We usually see two kinds of gearing systems:
- planetary gears
and two kinds of shifters
- twist grip - you operate these by twisting the grip as you hold it
- lever arms - you shift by pushing some paddle or arm (there are many permutations on the theme)