Awesome bead, I ran these tubeless on Surly HRD rims(not tubeless) without split tubes and without issue for approx. 2000 miles this summer. They have a pretty well balanced casing, no detectable mal-alignment at speed, and good durability. They roll really fast. They climbbrake ok. Weight is good in the 1200gm range. Why 3 stars? they don't corner very well- The shoulder lugs are the same as the center lugs and the tread swath is pretty narrow for a 3.8 tire. Terrible in mud, I didn't even give them a chance in snow, and a wider footprint would be better for sand. That said, I can only really recommend them for dry hardpack where you'll be on your A-game through the turns.