I’m guessing you have an XT-737 rear derailleur. They made GS (mid cage) and SGS (long cage). Hard to tell which one you have, but if it is a GS the max is 32t, but you can probably run a 34t without any problems.
John
Edit: Changed from long/super long to mid/medium and long. Same as m900 XTR, which I have only seen in mid cage and I’m running with a 34t.
Last edited by 70sSanO; 06-03-20 at 11:46 AM.