Designed as a wide, tubeless compatible, mountain rim option, the '35' part is a reference to its astounding width, which gives any wheel built with it a larger footprint with more traction. Very useful for cross-country and all-mountain riders who are looking for lateral stiffness without so much weight. We like to put 2" to 2.6" tires on this rim, and we like to use it to test the limits and to see where we can ride. Trivia fact: We do not make a downhill or enduro rim, though the B35 can be used for a variety of trail. If you're getting super gnarly and doing huge drops, this aluminum rim may not be your best choice. If you're riding rugged trails with roots and rocks and the occasional drop - sure!