Stan's Flow MK4 rims feature a durable 6069 aluminum with a welded joint and reinforced spoke bed \n (BSTAsymmetric) Bead Socket Technology 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 Bitex BX211F and BX214R hubs offer steel axles and a 54 POE steel freehub, appropriate for heavy trail use \n Built with double butted DT Swiss Competition spokes (2.0/1.8/2.0) and brass DT Swiss Squorx nipples \n Hand laced and trued in the USA