Wide extruded aluminum with welded seam, 22.5mm deep with reinforced spoke face and eyeletsItem Specifications: Number of Holes, 36, Type, Tubeless, Size, 26", Manufacturer Spec ERD (mm), 538mm, Color, Black, Model Name, MTX-31, Material, Aluminum, Brake Type, Disc, Width, 24mm, Wheel Depth, 22.5mm, Weight, 625g,.