Stans No Tubes, Flow MK4, Rim, 29'', Holes: 28, BlackLow profile 30mm internal width optimizes tire shape, traction, and control for 2. 3 2. 6'' tiresDurable 6069 aluminum with welded joint and reinforced spoke bedBST Asymmetric design combines Stans legendary easy tubeless inflation with a stronger, more balanced wheel buildReinforced spoke bed, combined with the offset drilling of the asym design, builds into an incredibly durable wheel that brings added confidence to every ride.