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 Spoke Type Sapim Wheel-Brake Comp. Rim Depth 18mm Rim Drilling 36 Valve Schrader Rim Color Black Rim External Width 23.5mm Axle Type Bolt-on Rim Construction Double wall Rim inner width range 0-21.9mm Rim Material Aluminum Rim Internal Width 18mm Wheel Diameter/ISO 26'' / 559 Wheel Tire Type Clincher Freehub Body Freewheel