Specifications: Condition:100% Brand New BB/Frame Interface: English Material: Aluminum Alloy Bowl + Plastic Tube Color: Black + Clear Spacer: Plastic Spacer X2 Applicable Bottom Bracket: BC1.37”X24T Installation Method: Threaded Frame Bottom Bracket Width: 68mm-73mm Crankshaft Core Size: 24-24mm Net Weight: About 100g Gross Weight: About 130g Feature: Fits 68mm-73mm frame bottom bracket shells. What is a ceramic center shaft? The ceramic center shaft is a ball bearing in a sealed bearing, made of black silicon nitride ceramic (Si3N4) .
