You can mullet Shimano (road shifters and MTB rear mech) but only 1X
Yeah, I thought I'd seen it done so went looking...
https://mariposabicycles.ca/2021/09/09/mariposa-feature-all-road-bike-with-shimano-grx-xtr-di2-mullet/
Both our gravel bikes are 2x so if I wanted to go lower gears I'd probably just try Roadlink with a 46T cassette. Actually, the grrl's cassette is worn out so I might just buy a 46T to try it out...
@hippy started
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You can mullet Shimano (road shifters and MTB rear mech) but only 1X