Wheel Factory hand built versatile wheels Stan's Flow MK4 rims feature 30mm wide asymmetric rim designed to build an even stronger overall wheel (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 Durable 6069 aluminum with a welded joint and reinforced spoke bed Industy 9's 1/1 feature made in the USA quality at an afforadable price 90 POE drive with 4 degrees of engagement Built with DT Swiss Competition double butted spokes (2.0/1.8/2.0) and brass DT Swiss Squorx nipples Hand laced and trued in the USA