Stan's Flow D rims feature a durable 6069 aluminum contruction with a pinned joint and reenforced spoke bed \n Optimal WideRight tire sizing 2.3"2.8" \n (BSTAsymmetric) Bead Socket Technology Asymmetric features a wider inside rim cavity with shorter sidewalls, equalizing resistance to dents and tire bead retention on both sides of the rim in the worst rock gardens and hardest cornering \n SRAM MTH 746 features a robust steel driver body with a 3 pawl driver and 746 points of engagement \n Built with DT Swiss Competition double butted spokes (2.0/1.8/2.0) and brass DT Swiss Squorx nipples \n Hand laced and trued in the USA