Is there an actual reason a 1x SRAM rear mech won't work on a 2x system?
How would it know?
The X-horizon ones won't. They have a horizontal parallelogram, and the movement of the jockey wheel laterally is controlled by the chain shortening as you shift up the cassette. A front shift will fuck it up.
@Tomo187 started
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Is there an actual reason a 1x SRAM rear mech won't work on a 2x system?