• I've seen people using the GRX double with 42, 40 also fairly common and works reasonably well without roadlinks or any other bodge.
    TL;DR GRX double and as big a cassette as you can fit without compromising the shifting too much.

  • I'm that person. I've been running 40T and 42T MTB cassettes on road Di2 and more recently GRX since some ultra races in 2019. Before shadow cage RDs it was 36T and before that 32T and 28T.

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