The Crupi Precise External Euro BB places the bearings outside of a Euro bottom bracket shell, allowing the use of much larger and more durable bearings. Precision sealed bearings, precision fit with no more plastic dust seals and Precision performance! Features: Machined tool slots so the tool will not scratch your bottom bracket Modified low friction alloy seals with less drag Arguably the lightest weight external bottom bracket offered today Compatible with 24mm race cranks designed to be used with external bottom brackets Specifications: Spindle Type: 24mm Weight: 3.24 oz