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I have a Microshift cassette on my mtb and can recommend, quite cheap too. Don't know if weight is important to you?
https://www.microshift.com/models/cs-h103a-11-42t/
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Ah, I think I saw them before. Maybe when I was looking for an 11-42 11spd cassette that was all steel. That 10spd 11-42 might be an option. I'm looking at installing a GRX RD I have onto my gravel bike, then moving its Ultegra RD to my partner's bike and then taking her Wolftooth off and sticking it on the Tarmac to get lower :)
Interesting. Just visited this thread because say I wanted to stick 11spd on my old-as-fuck Tarmac... it currently has DA7800 10spd shit on it (well, the RD is XT so I can run a 36T cassette so it's only shifters and FD). I want to run lower gears, ie. MTB cassette 11-42 say, which requires a longer, shadow cage type setup and/or maybe a goatlink.
Actually, now I'm writing this, could I stick a roadlink/goatlink on the XT RD and does a 10spd 11-42T cassette exist?
I guess it is possible
https://www.youtube.com/watch?v=vvDvZViRFN8&t=207s