Took a nasty spill on a seesaw and the bike landed derailleur first on a wooden bridge. The hanger was slightly bent but now it’s within 1mm all the way around.
I can get it to shift throughout all the gears, but in one gear it double shifts, then corrects itself, and in others it rubs the next gear so it makes a clicking noise.
Thoughts? Thanks for reading!
by the_knob_man
6 Comments
Looks like a replacement derailleur hanger is in order.
Take off your old derailer hanger and put it in a cup of water. If it sinks, you need a new one.
It’s rare that an RD gets bent right there. Check the cable housing, cage, and pulley wheel alignment.
Did you straighten the hanger? If so, with what tools?
Have you adjusted the cable at all?
When you say “within 1mm all the way around” do you mean you used an alignment tool and that is how close it is to the rim at North/South/East/West?
Are the bad shifting spots at the big cogs, small cogs, or somewhere else? You may need to adjust the limit screws if the derailleur is straight, but ended up with a slight S-curve in it making it closer in towards the cogs. Index it with those loosened a few turns to eliminate them from the equation, then set them correctly afterwards.
Dumb question, but you say it’s double shifting and rubbing the next gear in several gears, so you’ve attempted to adjust it, right? (probably decreasing effective cable tension by screwing adjustment barrel “in”).
I assume it didn’t have any indexing issues before the crash? I once had a similar issue (indexed fine on one side of the cassette, but didn’t on the other, adjusted indexing on “the other” messed up the former), and my issue was that my cable housing was too short. But if you didn’t shorten the housing, maybe not.
Are all of the cable ferules seated in their stops properly?
Is there much slop in the derailer? Grab the lower knuckle near the guide jockey and wiggle.
Is the guide jockey turning well?
Does the cage move smoothly?