Velocity A23 Rims Tubeless ready. For tubeless setup Velocity recommends their 21mm Velotape (RS1005). 23mm wide rim profile increases tire contact patch and improves ride comfort & performance. Item Specifications: Color, Black, Weight, 420, Hub Drilling, 32, Rim Depth, 19.5, Manufacturer Spec ERD, 550, Valve, Presta, ISO Diameter, 571 / 650c, Wheel Size, 650b, Tire Type, Tubeless Ready, Rim Center Offset, 0, Rim Joint, Sleeved, Brake Track, Machined, Defined Color, Black, Rim Width (External), 23, Rim Material, Alloy, Rim Width (Internal), 18,.