I installed this for a 12 speed sram force drivetrain and it works great. Even tho they say not to, ppl on reddit got it to work. I’m not going to buy a new trainer for my new bike, that’s like another grand for nothing. I was really disappointed in saris they didn’t officially support 12 speed but I’m glad I can get it working with my newer setup. I guess the derailleur is close to the trainer while in the largest cog in the cassette. It still appears to clear the trainer body and be 100%safe. I’ve already logged a few hours and all is well with this setup.