Originally Posted by
RubeRad
Hmmm, is doubled up bad, or exactly what I need for this derailleur to handle 42 teeth?
My problem is not good in the middle, bad 'further out', I'm rock solid on 6 big cogs, terrible on 3 tiny cogs and iffy on #4
Well, 'doubling up' does change it from how WT designed the GL and the guide pulley will be in a different position. Did you check if your RD is one of the proper models? The GL is sized to replace the B-link, so it is the correct thickness & has the 'tab' in a different position. (see the attached, the GL is similar to the DM, which also replaces the B-link).
The B-link normally attaches to a standard RD hanger (left).
If you have one of the proper model RDs, it should fit the GL w/out the B-link and work with 42T.
If your RD is not one of the supported model, you can only mount it as you have, with the inherent possible issues.