• I have bought a SRAM gx 2.1 rear derailleur and whilst fitting, noticed that it's flapping about like a flaccid thing instead of being properly secured to the dropout like all my other derailleurs. Vendors customer service says it's a-ok, I am unconvinced. What does the hive mind say?


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  • That's exactly what all the Shimano Shadow Mount derailers do.

    Just make sure you install it above any stoppers/lips (whatever they're called) on the hanger.

    I lift it right up, tighten a bit and let it drop, then fully tighten.

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