SL Race BMX screw-on freewheel hub. Forged and Cnc'd alloy body with mid height flanges.15mm alloy axle with 3/8" Cro-Mo bolts and alloy caps.2 sealed cartridge bearings.Wide flange spacing increases spoke triangulation.32H or 36H. Colour: Black or Red anodised. Weight: 175gCentre - L 37mm Centre - R 29mm Flange Dia. 45mm