Specifically designed for practicing BMX Race with Oversize technology, the carbon rims BOX Hex Lab are made from ultra high modulus carbon fibre, which is stiffer than other carbon fibres. They feature sculpted stabiliser reinforcements shaped like a ball for each spoke hole, designed to bridge the angle between the rim's inclined sides and the vertical plane. With a medium height profile, they offer 2 different rim types for the front or rear depending on the braking system used, and have wide internal dimensions for compatibility with tubeless setups. FEATURES : • Carbon Rim Ultra High Modulus • Unique symmetrical dihedral angle stabilisers • Dimensions: 451xmm (20"x1-1/8"-1-3/8") • Front Profile with sidewalls without brake surface • Tubeless Ready • Width: NC • Height: NC • ERD: 427 • Drilling: 28 holes • Valve: Presta F/V • Weight: 299g NOT COMPATIBLE WITH V-BRAKE BRAKING SYSTEM Recommended spoke tension: ≤115KGF