The GX DH A3 is a downhill-specific seven-speed mechanical rear derailleur. X-Actuation and X-Horizon geometry are paired with a Roller Bearing Clutch for chain management and Cage Lock for wheel handling.
This black medium-cage selection lists a 28T maximum sprocket. Match the downhill seven-speed cassette and compatible DH shifter system before fitting. It is distinct from the 11-speed GX trail derailleur despite shared names in the product range.




