ok this is the problem... my front derailleur was only shifting to the third gear. then i was messing with the H & L thing on the front derailleur and now it will not shift anything how can i fix this
Ok, the H and L thing on the front derailleur set the limit of how far in or out the derailluer will travel. If you have them screwed all the way in the derailluer will not move. back these screws out to a point where the derailluer only moves far enough to the inside and out as to not push the chain off the chain rings to the inside or outside. after this you might need to check your cable tension. The cable tension is usually the problem when it comes to shifting problems. The cable will stretch and this does not allow for a clean or quick shifting response over time.
Check the tention in the cable. If necessary, adjust that then, reset your H & L screws so the derailleur shits all the way across. Once you're at that point, just carry on with minute adjustments and you'll be riding again in no time :o)
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