Wow thanks for all the replies. I guess I'm better off sticking with Shimano.....Hmm.....I'm quick new to all of this so don't mind if my questions are way out of tune but is it possible to run the "2019 Shimano XTR 9100: 10-51 12spd cassette" on my current setup (Shimano CS-M8000 cassette 11spd , XTR RD-M9000 derailleur, XTR shifter)?? I guess the ultimate question is can i run 12spd on my current 11spd setup?