This rim features a super-durable alloy construction to ensure it can take everything the mountain throws at it, while also staying lightweight to keep climbing easy. The durability is further enhanced by the I-Beam construction, while the dual support beams increase the stiffness for consistent, reliable handling. Plus, the 4D angled spoke drilling disperses tension evenly to allow for a fast-rolling performance. Technologies: UST Tubeless Ready: The UST concept improves traction, control and comfort while reducing inertia and flats. TCS 2.0 Technology: This refined version of the “Tubeless Compatible System” offers the same high performance, lightweight mountain bike rim structure, but is now easier to install and more dependable.