[psychodad]

I can't get the rear deraileur on my build-up bike to shift consistently at all.
I've tried different cable lengths, more new cables, nuthing!
Does Avid still make the roll-a-majig?? I can't seem to find one.
I used a roll-a-majig 10 years ago and it worked like a charm, I thought I was going to get off easy again.
Or, could someone suggest a really good shifter cable set.
Thanks,

 

[MTBracer]

Do you have compatible Derailleur and Shifter? SRAM don't work with Shimano (for instance). And have you tried adjusting the actual derailleur? Just replacing the cables shouldn't really affect much. Maybe a little smoother, but it shouldn't make it so it doesn't work at all.

 

[Quo Fan]

I could be that the hanger is bent. If you don't have the tool, or access to one, take the bike to your LBS and have them align the hanger.

 

[psychodad]

The shifters and derailleur are Shimano XT and they worked fine on the previous ride. I've tried 3 cables and I've prestretched them and adjusted them for stretch later. I've been jerking with the barrel bolt every time I stop. It shifts great when I flip it over and click thru the gears.
THe frame was brand new, I never even thought to look at the hanger, but I just checked it and it is nice and straight.

What I dont like, is the way the last cable does its loop around to the derailleur. It comes out funny looking even when I put a new piece on.
I am going to try a brand new derailleur later today and another loop of cable.

Maybe I can find a BS with a rollamajig still on the shelf.

 

[Quo Fan]

Brand new frames can come with misaligned hangers. I check my hangers when I encounter shifting problems, and when building up a new frame, or anytime I have the derailer off the bike.

 

[Wumpus]

What frame is it?


You might try a full length housing run. That would hopefully rule out whether it is getting hung in a cable stop or has a bad bend somewhere.