How To Fix Bent Derailleur Cage. One can attempt to use the same method to compensate for a slightly bent derailleur again just reefing until things look parallel. You can eyeball the derailleur cage alignment by looking down the chain-line from the back of the bike - see image below from this question.
Any advice is welcome. You can eyeball the derailleur cage alignment by looking down the chain-line from the back of the bike see image below from this question. I found a free Trek dumpster bike with a broken mangled derailleur.
Straighten Rear Derailleur Cage not hanger Hey all -- few weeks ago was out for a ride on my carbon gravel bike.
After my first half dozen rides my shifting got pretty ugly and I went through aligning the derailleur hanger re-indexing making b. Any advice is welcome. Upon further inspection the lower jockey wheel seem to be bent outwards what makes this a mystery to me is that there are obvious scuff marks on the parallelogram of the RD while the cage has no signs of impact but then again if the whole derailleur is somehow bent and not just the cage then both the TOP and the bottom jockey wheels would. An easy way to test if this is the case is to look at it from the top.
