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Tuning 9-speed 105 rear derailleur(8 posts)

Tuning 9-speed 105 rear derailleuredmundtan
Nov 23, 2003 5:59 PM
I migrated my 9-speed 105 groupset and components from a one Giant TCR frame to another and largely, everything was fine. The only significant thing I had to do was to readjust the limit screws for the front and rear derailleurs.

The problem I face is that the rear derailleur now cannot be tuned precisely. The best I could get is that in the higher gears (smaller cogs), the derailleur is slightly undershifting, and in the lower gears (larger cogs), it is slightly over shifting. The derailleur will still shift throughout the range, but will be a bit noisy at the extreme smaller and larger cogs due to the slight misalignment of the jockey wheels

It does seem like the shifter (Dura Ace STI) is now pulling more cable. Quite odd as the rear derailleur setup were easy to tune in the previous frame.

Any comments or suggestions will be most welcomed?
re: Tuning 9-speed 105 rear derailleurRusty Coggs
Nov 24, 2003 6:23 AM
Bent derailer hanger?
re: Tuning 9-speed 105 rear derailleuredmundtan
Nov 24, 2003 1:41 PM
The frame is new but a bent derailleur hangar may be a possibility. Can't tell for sure by eye-balling but it looks OK.
Cable attached to the correct side of the bolt? (nm)TFerguson
Nov 24, 2003 11:26 AM
Cable attached to the correct side of the bolt? (nm)edmundtan
Nov 24, 2003 1:43 PM
Yes it is. I also made sure the cable sits in the groove properly when clamped.
Exact same shifter, cassette and deraileur? (nm)TFerguson
Nov 24, 2003 6:25 PM
Exact same shifter, cassette and deraileur? (nm)edmundtan
Nov 25, 2003 6:00 PM
Yes, exactly the same.

This is a wierd problem. I will bring the bike to my LBS to see if they can fix it, maybe swap out the cogset spacers or something.
Let us know the solution. (nm)TFerguson
Nov 26, 2003 5:16 PM