Mongoose 21 speed sram xr75
There are two small screws located on the derailleur. Hi/Low
http://www.parktool.com/repair/
this might help too
You have to screw the cable adjuster all the way in for starters. Then you pull the derauiler all the out to the largest sprocket nearest the spokes and tighten the cable down here. Now there are 2 adjusting screws that limit the travel and adjust these ever so slighty as a little goes a long ways. Shift therough the gears with the bike inverted is the best method while doing all of this. You will be able to make the adjustment so the derauiler goes from the largest to smallest sprocket by these 2 screws if done properly. you may eventually have to tighten the cable adjuster also in some cases for proper travel.
Better off if you let a shop do this if you go tofar you can throw the derauiler into the spokes and mess everythign up BIGTIME for the few $$'s it amy cost ya. GOOD LUCK
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I have a mongoose xr75 racing elemen When I was riding it 30 minutes ago by the way it is a 21 speed with 26 inch rimingThen the ball barrens went out on both wheels what should I do
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