Cane Creek 40 IS52/40 Bottom 40-Series Represents the Perfect Balance of Performance, Durability and Value Tops and Bottoms Sold Separately As Part of Cane Creek's Tapered Headset Solution Sealed Black Oxide Steel Cartridge Bearing Durable Steel Crown Race with Low-Friction Face-Seals Consistent Stack Heights Across 10, 40 and 110 Series Internal Parts Are Cross-Compatible Across 10, 40 and 110 series