Double wall, welded 6061 Series Alloy rim. Tubeless setup is a snap with STR Tubeless technologyItem Specifications: Number of Holes, 28, Type, Tubesless, Size, 29", Manufacturer Spec ERD (mm), 606mm, Color, Black, Model Name, Duroc 30, Material, Aluminum, Brake Type, Disc, Width, 26mm, Wheel Depth, 17mm, Weight, 465g,.