Features of a Mountain Bike?

  • Thread starter Thread starter hd_revolution
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hd_revolution

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Hi. I recently got a new mountain bike and on my handlebar I have two gear like functions. On the right hand there's the gear control which is a gyratory slider enabling me to change the gears from 1-7.

On the left hand is an unknown function to me which is a gyratory slide as well with an H at the top and an L at the bottom of the circular function.

What does this function on the left hand do to the bike?
 
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