The ARC Offset rims utilize an asymmetrical design to optimize spoke tension balance, wheel durability and wheel stiffness. New 6069 Alloy provides a superior strength to weight ratio, significantly improving toughness.Offset nipple bed for improved spoke tension balance and wheel strength/stiffness. Tubeless ready, strong tire retention bead. Item Specifications: Brake Track, None, Color, Brushed Black Anodized / Vinyl Decals, Hub Drilling, 28, Rim Width (Internal), 30 mm, ISO Diameter, 622 / road / 29", Rim Material, Alloy, QBP Measured ERD, 597.5 mm, Rim Center Offset, 4.25 mm, Tire Type, Tubeless Ready, Valve, Presta, Wheel Size, 29", Weight, 525 grams,.