My bike shop sales rep is useless?

T

tommycat

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so I may need to take matters into my own hands. My bike chain derailed and so I took it back to the shop. The guy fixed it and told me everything on it looked good. While riding it back home the chain came loose again.

It seems to pop out when I'm shifting my left side. It works fine when I shift the ride side as long as I keep the left side on 2 (I have 1-3 on that side). Keeping in mind I never use gears 1-3 on the right while I'm on 3 on the left side and vice versa.

I'm convinced the sales rep doesn't know what he's doing. Is there a way to visibly see whether the chain is too loose or too tight, thereby, slipping out everytime I shift my left gears? I think this may be my problem and I don't know how to fix it as long as I don't know what the problem is.

Thanks.
 
Are you letting up when you shift ? You can't shift gears when you are pedaling hard. The chain tension is controlled by the rear derailleur and should not be anything to worry about. If the chain is coming off the smallest sprocket the high limit screw needs adjusted. It will be marked with a "H" on the rear derailleur and it prevents the chain from moving too far to the outside. You can turn it in 1/2 turn and try it, if it wont go into the 8th gear or jumps back out you went too far.
 
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