Shimano Mountain Bike Derailers
Why won’t the chain on my bike stay in gear?
The chain on my mountain bike will not stay in gear on the rear sprocket. It seems like it just doesn’t want to stay in a single gear and will “pop” from one to the other. It turns a bike ride into a cursefest. How do I fix it? The rear derailer is a shimano something.
Oh, and I want to fix it myself…not take it to a shop.
it can be caused by cable stretch. over time, cables tend to stretch and it throws the adjustment out. there is a tension adjustment on the rear derailer, the nut the cable runs through. it would be one you can turn with your fingers. backing it out, turning it counter clockwise adds tension to the cable. you shouldnt have to turn it much, if you turn it some and it doesnt solve the issue, the cable has either slipped or something else is out of wack.
the way it should work is with the chain on the smallest cog, it should run smooth and quiet. if it isnt you need to adjust the derailer stop until the chain runs smoothly on the smallest cog. if there is any slack in the cable, you may have to loosen the holding nut and pull thru the slack. by the same token in that small cog, the cable shouldnt be extremely tight either. there it is on the stop, and the cable should be relaxed, but have no slack. then you should be able to click it once, and it should shift. if it doesnt, you have back out the adjusting nut until it does make the shift and runs smooth in the next gear. once you have that, it should shift correctly from there. though it isnt that hard, trying to explain it here is. i could show you easily in person. trying to explain it over email, not so much.
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