The NOX Kitsuma Carbon Rim is for those times in life when you just don't care about light weight mountain bike rims. Like when you're staring down a fall line, psyching yourself up for riding at your limit, that's when the Kitsuma rim belongs on your bike. Time and time again, the benefits of a wide rim have been shown. NOX was hesitant to go this wide for a long time, since the selection of tires that work well for a rim like this were lacking, but times are changing and tires are now available which take full advantage of a beast of a rim like this. When you put on properly sized 2.6-3.0" tires on this rim, get ready to experience grip and lateral holding forces like you didn't think were possible on a mountain bike. The combination of stiffness, stability, compliance, low rolling resistance and raw grip are game changing. The Kitsuma gets all of NOX's latest technology, including UniWeave construction, the Anti-Burp Bump, the strongest RockGuard Hookless bead lip NOX ever made and asymmetric offset design which improves spoke tension equality. Rim features 42mm external width, 36mm internal and 30mm depth. Lifetime warranty and crash replacement policy.Note: If you are planning to run 2.1-2.3" XC tires, you will be better served with a narrower rim.