Brompton specific classic J-bend spokes, 2.8mm holes. 16-20-24H. Compatible with A-C and P-Line Flanges are compatible with standard steel spokes and Berd spokes too. 74mm wide, oversized 14mm axle. Hub is supplied with special Titanium bolts for extreme light wheel securing (B-Lock system). ABEC5 low-friction sealed cartridge bearings with external hexagonal preload tuner. Black anodized body with laser etched graphics, "Hart-Coated" axle-ends. Bearing options: Abec5 Steel, 440C Stainless Steel, HDC Hybrid Ceramic, XD-15 Ceramic. Weight: 43g (B-Lock special securing system 3+3g)