Durable mountain bike rim with easy tubeless set-up available in 27.5" and 29", perfect for fast trail and enduro bike wheel builds. These are an excellent balance of strength, weight and durability. Their 30mm internal width is perfect for modern MTB tyres between 2.3 and 2.6". The Stans Flow MK4 rim's reinforced spoke bed combined with the offset drilling of the asymmetrical design; builds into an incredibly durable wheel that brings added confidence to every ride. Unlike many asymmetric rims; the Flow MK4's BST-Asymmetric shape is designed to equalize resistance to dents and tire bead retention on both sides of the rim under even the worst rock gardens and hardest cornering. Combined with Stan's patented Bead Socket Technology; the Flow MK4 rim offers the easiest tubeless setup. 32 spoke holes Low-profile 30mm internal width optimizes tire shape, traction, and control for 2.3-2.6 tires Durable 6069 aluminium with welded joint and reinforced spoke bed BST-Asymmetric design combines Stan's legendary easy tubeless inflation with a stronger, more balanced wheel build 3-year rim warranty with 1-year crash replacement