What's the function of oxidized metal?

Whats the function of gera in bicycles ?

Hardik S at Yahoo! Answers Visit the source

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im curious as to exactly what a gera is?

moondancer

Your "lowest" gear will deliver a lot of power to the rear wheel, but not much speed. This is good for going up hills. Your "highest" gear will deliver a lot of speed to the rear wheel, but not much power. This is good for going down hills. Start with the middle gear for riding on flat terrain. Shift gears to get more power or speed as your terrain changes.

intrepidfae

They help you ride different speeds when going up or down hills etc like a car to a degree

LEON

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