Originally Posted by
wsteve464
I believe you can use an MTB Di2 rear derailleur with GRX components and it goes up to 42 teeth on the rear with no problem.
Looks like the DI2 GRX derailleur would work too. Unfortunately the derailleurs cost a small forture. Had another idea. There is an SLX crankset with 38T/28T (SLX FC-M7000-2) which will work with a 11-42 cassette. That combo would yield ~17-18 gear inches. Is there a front derailleur, rear derailleur, and set of hydraulic STI shifters that would work this this combo? Could be a winner.
Dave