Re-upping this...as I am exactly in the same situation, Scott Scale 950 2014 here, Syncros / Alex Rims XC39 .....and I'm wondering if a 2.4 or 2.5 maxxis, or even a 29x3 inch will fit without too much problem on my rims (front wheel).Metamorphic, thanks for the response. I am not planning on going tubeless if I use these rims. I hear what you are saying about buying wider rims but the bike is brand new and I hate sinking another five hundred into it. I think I could easily run the 2.2 because stock is 2.1. I am wondering if I could run the 2.4 with tubes.