Rims: WTB DX18 26'' (ETRTO 559), inner width: 18 mm Anodized black finish CNC machined sidewalls Stainless steel eyelets Rim wear indicator Pinned joint Drilled for Schrader valve 36 holesFront hub (-01): Alloy, Bolt-On, Solid CrMo axle 3/8'' x 100mm (L:140mm) Anodized black finish Adjustable bearings with rubber seal Flange Nuts includedRear hub (-02): Alloy, Freewheel, Bolt-On, Solid CrMo axle 3/8'' x 135mm (L:175mm) Anodized black finish Adjustable bearings with rubber seal Flange Nuts includedAssembled in North America by experienced wheelbuilders using Sapim 14G Stainless Steel spokes and 14mm Brass Polyax Nipples Attributes Axle Type Bolt-on Rim Color Black Rim Construction Double wall Depth 18mm Rim Drilling 36 Rim External Width 23.5mm Rim Internal Width 18mm Rim Material Aluminum Spoke Type Sapim Valve Schrader Wheel-Brake Comp. Rim Wheel Diameter/ISO 26'' / 559 Wheel Tire Type Clincher Rim inner width range 0-21.9mm