Behold: the 27.5+ version of our popular, fast-rolling Knard tread pattern (bet you didn't see that coming!) Coming in at a hearty 27.5 x 3", it's designed for 35-50mm rims with a bead seat diameter of 584mm (27.5"). The 3" casing rolls out to 29" when inflated. That gives you all the benefits of a 29er like more ground clearance and the increased ability to roll over obstacles better with a slightly wider footprint and some extra cush. The closely spaced low-blocks of the Knard tread grips well on multiple surface types but is most at home on dry rock and packed dirt.