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New Ultegra drivetrain chain skip?(4 posts)

New Ultegra drivetrain chain skip?gs6769
Sep 5, 2002 6:10 AM
All new Ultegra drivetrain w/ approx 150 miles. It's developed an irregular chain skip on the rear cogs. Usually happens while spinning away at 100-105 rpm, not too often under heavy load save for from a standing start once in a while. Cable stretch issue solved by barrel adjuster or other cable adjustment? Normal "running in" process? Throw entire bike in trash? (just kidding). All replies appreciated.
I'd take a good long look at your chain.Spoke Wrench
Sep 5, 2002 6:20 AM
Three possibilities come to mind immediately:
1. Chain length. Since it tends to happen under high cadences, I wonder if the chain isn't a little too long and the bottom run is bouncing enough to slip occasionally.
2. A tight link. Turn your cranks backward with your hand and watch where the chain comes off the bottom derailleur pulley. If you see a "flinch" you have a tight link. Loosen it up.
3. Is it a Shimano chain? If so, check the back side of the connecting pin. If it isn't broken off flush with the chain's side plate, take a file to the pin and smooth it out.
Thanks Spoke! You've outlined my evening project! (nm)gs6769
Sep 5, 2002 7:48 AM
re: New Ultegra drivetrain chain skip?Chen2
Sep 5, 2002 9:53 AM
Spoke Wrench is probably right, as always. But I'll bet your problem is cable tension and you just need to adjust the rear barrel adjustor.
~Al