• Thanks.

    Oh, I didn't know there was a clutched Ultegra RD. I was thinking about sticking a GRX RD on the Mason but perhaps a clutched Ultegra RD would be better. I wonder if it can also cope with my 42T MTB cassettes...

  • If you mean the Ultegra RX derailleur. I use the mechanical version with a 11-42 SLX cassette all the time

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