How do you fix mountain bike shifters?

hi asked: I have a motive bike. And when i shift in to low gear my shifter in the back hits the wheel. And it jumps gears. When it goes into the high gears it makes a loud nose.
please help

bmx or mountain bike?

rockman asked:
I’m an adult male but i don’t like gears on the mountain bike and i was told that bmx bikes are for kids. I used to have a mountain bike and the chain kept popping off due to my inexperience with gears and i figured the bike was a waste of time.
I’m only using [...]

how do i use a 18 speed gear mountain bike?

Jordan M asked: i just got a mountain bike it has 18 gears but not sure how to use it here is a link of the picture of the bike http://bigw.com.au/sport/bikes.html and the bike you need to look at is the Boys ‘Doom’ Dual Suspension Mountain Bike
if you have a better picture of the [...]

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