Sturmey Archer single-sided drum brake hubs (X-SD) Left single side mounted hub with 70mm drum brake – Specific side mounted, left side – Solid axle – Now with high polish hubshell Specs for Solid Axle Model HSL881 Side: Left Axle Type: HSL881 Solid Nutted Axle Diameter / Type: 12 mm (0,47 inches) Axle Length: 130 mm (~5,12 inches) (Excl. M19 Hex Bolt Head of 4 mm (~0,16 inches)) Axle Protrusion Length: 50mm (~1,97 inches) Hub Shell Material: A356 Aluminum Bearing Type: 6001-ZZ Sealed Cartridge x 2 Spoke Holes: 36 Pitch Circle Diameter: 89.8 mm (~3,53 inches) Flange Width: 54 mm (~2,12 inches) Spoke Compatibility: 13g or 14g (~0,03 pounds) Weight: 790g (~1,74 pounds)