650B

If you have to pick one A versatile XC tire with excellent traction provides confidence for most trail conditions. Versatility is the name of the game for the XR3 Comp mountain bike tire. It's the quickest, highest-value rubber for the widest variety of trail conditions—from hard-packed singletrack to loam and everything in-between. - A versatile trail or race tire that excels in a wide variety of conditions - Aggressive side knobs provide consistent cornering and traction across multi-trail surfaces