ARC 31 Carbon Rims take notes from our Next R carbon wheelset; built to handle the most challenging days on the trail. The ARC 31 have been redesigned to take full advantage of the benefits carbon fiber has to offer. Featuring a generous 31mm internal width for modern tire widths with lower pressures. Lace these rims to your favorite hub and you’ve got a world class wheelset ready for action. Compatible with standard external nipples (sold separately). UD Carbon fiber construction. 31mm Internal width tubeless ready rim. 4.5mm Offset - Improves spoke tension balance and wheel stiffness. Color: Black. Weight: 495. Hub Drilling: 32. Valve: Presta. ISO Diameter: 622 / road / 29". Wheel Size: 29. Tire Type: Tubeless Ready. Rim Center Offset: 4.5. Rim Joint: Carbon. Brake Track: None. Defined Color: Black. Rim Width (External): 37. Rim Material: Carbon. Rim Width (Internal): 31. QBP Measured ERD (mm): 590.5.