Cane Creek ZN40-Bearing 52mm 45 x 45 Zinc Plated. 40-Series replacement cartridge bearings feature durable black oxide construction. Compatible with 110-, 40-, and 10-Series headsets. Sold each. Specs & Information Sold individually Bearing I.D. (mm): 40.15 mm Thickness: 7 mm Bearing O.D. (mm): 52 mm Bearing Type: Cartridge Cartridge Bearing Angle: 45x45