Shimano PRO Cartridge Headset Lower Semi-Integrated ZS56/30

Fits a standard straight 1-1/8" fork steerer tube into a tapered 1.5" bicycle head tube

• Type: Zero-Stack (ZS) lower cup, semi-integrated

• Head Tube ID: 56 mm

• Fork Steerer Size: 1-1/8 inch (30 mm crown race/converter)

• Bearings: Double-sealed, high-quality steel/CrMo for durability and smooth steering

• Material: Anodized aluminum cups