Bicycle Mechanics - chain skip
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09-07-06, 09:45 AM
I am getting chain skipping when taking off from a stop or steep climbing. Entire drive train is 9-speed 105 triple. I plead guilty to not replacing my chain soon enough, but have since replaced both the chain and cassette. (It started skipping before the replacement.) The new chain was shortened per Shimano recommendations for length. The chain rings all look fine, and the skip will occur on any ring.
Could the rear derailleur be the culprit? It seems like there would be no real force on the pulleys, and it appears to be okay, well aligned, no excessive play.... It does not jump gears. I have adjusted the B-tension screw this way and that, but no difference. I even tried putting an identical wheel on temporarily, but it still skips. Any ideas out there? Thanks.
How do the teeth on your crank look?
09-07-06, 02:26 PM
This could be chain skip OR your freehub body might need cleaning/servicing. Dirty freehubs never seem to engage properly.
this jus seemed to happen to me. had it serviced for $8 . the other lbs said i woudl have had ot replace the chain (evil evil) but yea.. apparently i had problems with one of my chain link?? i'm not sure actually.. he didn't explain it in a language that's too easy for me to understand :-p
but yea.. gl with that.. or jus go get it serviced and see wat hapens.
09-08-06, 12:02 PM
thanks for the replies. like i said, the chain rings don't look very worn, but i'm no expert... how do you "measure" that? just to be sure, i'm gonna borrow the 105 cranks off of my girlfriend's bike this weekend and see if it makes any difference.
09-08-06, 05:44 PM
does your chain have a master link? i know shimano chains don't. it could be that when you put in the rivet you didn't have it perfect, and thus the link doesn't move the way it should. i think this is what ed202d was talking about.
I get only it when I wrongly stop in the worst gear combo. I'll be riding on the middle front ring and small rear cog, and I'll have to downshift due to a stoplight, so I'll shift to the granny gear at the front. The small ring at the rear doesn't have enough teeth to hold the chain when I start up again, so it skips. I have to remember to shift to a larger rear cog in that situation. I'm also probably due for new cogs and chain.
09-08-06, 06:24 PM
i've had the frozen link before; the shimano replacement connecting pins will do that too. but i checked several times when i put on the new chain (hg-73) and all is moving freely. the more i think about it, the more i believe it has to be the chain rings. i've already started looking around for some new ones....
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