M. Bakunin said:In article <[email hidden]>,
D'ohBoy said:M. Bakunin said:hello all,
i have a problem i can't understand.
campagnolo centaur group, 10-speed, cassette 13-29, long cage
derailleur, chain chorus 10-speed.
everything is set as it should, and working very well.
but.... sometimes (happened 3 times in a dozen rides or so) if i
downshift more than one speed at a time, my chain jumps.
anybody out there had or has the same problem?
someone suggested to me to take off a link, even if the chain is the
right length. but before i commit a $100 to buy the campagnolo chain
tool (working their 10-speed chain is a pain in the neck with my chain
tool) i'd rather wait and hear from someone else experience....
Quoted message said:Not quite sure what you mean by "my chain jumps". Jumps where?
out of the big chain ring, toward the outside.
Quoted message said:A little clarification would be helpful. Is this a triple or double?
double.
Quoted message said:How do you know everything is set as it should be? If it were, would
because i just build it. and brought it to a shop for a mechanic to
check it out.
because this is not my first bike, because i do the maintenance on my
bikes (road and mtb). but here i'm puzzled...
Quoted message said:What is your bike seatpost made of?
why? you're in the market for one?
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Sorry about the red herring "seatpost" question. So your chain jumps
off the big ring in the front, to the outside?
Older steel, or less stiff frame? Do you get a lotta chainrub on the
fder? Is your big ring worn? How old is your chain? Combo of new
chain and old ring or vice versa would also contribute to this
happening.
Sounds like you are hammering and you have some serious frame flex
happening. I can't think of any other cause - the slack in the chain
due to the momentary motion of the rear der allows while you are at
the peak of your power stroke on the drive side forcing the bb area and
crank to the left relative to the chainline and pop! off the chainring
to the outside (and the chainring or chain wear would also contribute
to this).
A perfect storm of mechanical factors.
Good luck and please, if you do solve this, let me/us know what the
solution was.
D'ohBoy
