Garage Files: How To Realign A Bent Derailleur Hanger

 

Check that the tip of the indicator is approximately the same distance from the rim as you work your way around the wheel. Check at least three positions. Push or pull on the tool until the alignment is as close as possible for all three points of reference. The more practice you have with this task, the easier it will become.
Reinstall your rear derailleur, paying attention to its bracket stop and how it mounts on the hanger. Refer to your cellphone photos from Step 3 if needed. Next, make sure to not over-torque the rear derailleur, as this could misalign the hanger again. Keep in mind that your derailleur’s high- and low-limit screws will likely need to be readjusted as well as the cable tension.
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