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chain keeps leaving chainring(7 posts)

chain keeps leaving chainringishmael
Sep 9, 2001 12:41 PM
twice in a race today my chain popped off the chainring to the inside when i went to shift to the large makes sense to jump to the outside of the chainring to me when going to the big but it keeps going to the inside, what should i do
re: chain keeps leaving chainringGregJ
Sep 9, 2001 1:11 PM
Are you making this up?
Sep 9, 2001 1:42 PM
im not making it up
I guess check the levers outGregJ
Sep 9, 2001 2:08 PM
Does your FD work at all, is this an intermittant problem? Does the chain ever pop off during a normal large to small ring shift? I am having a lot of problems thinking of a cause for this, um, check out the shift levers. Maybe the lever is releasing the FD during the shift outward, your FD stop is set to far inward, the FD moves the chain inward due to it's spring tension, and the chain pops off. Maybe this is related to your cranks stopping in mid turn. Maybe check with a bike shop mechanic. On an unrelated note, did you get your legal troubles resolved? Personally I thought you got kind of a bad deal, I think the police officer should have given you a warning about the potential problems around trespassing or whatever and sent you on your merry way, I hope it worked out for you.
going to court tomorrowishmael
Sep 9, 2001 4:55 PM
ill update what happends..disorderly conduct is the charge
need more infoTig
Sep 9, 2001 2:06 PM
Otherwise, take it to a good mechanic at a LBS. Maybe the derailleur has twisted or is damaged. The limit sets don't sound like the problem.
bottom bracket...grassy knoll
Sep 9, 2001 8:12 PM
check that the bottom bracket has not become loose and is slowly backing out of the frame. happened to me a couple of years ago. if this is the case you will see a small gap between the bottom bracket shell and the flange of th b.b. only takes a couple of mm to throw off the chain.