Fits Current 1-1/8” Zero Stack system but without the cups

The same features as the ZSI-47 headset but designed to fit frames using the current 1-1/8” Zero Stack headsets.

Fits 41mm x 47mm headtubes.

Lightweight and strong duraluminum alloy construction.

Tange Seiki exclusive EZ system on upper unit.

Tange Seiki specially designed ZSI-50 adapter cups.

Technical Information

  Material   Height Information
Upper Unit A6061-T6 Light Alloy 13.0mm ID 28.8mm / Pre-assembled Compression ring & Seal ring
ZSI Cartridge Bearing x 2 SUJ2 Steel 8.7mm Insertion 44.0 +-0.025
Crown Cone SS41 Steel 4.6mm Insertion 30.0 +0 -0.1/ with Seal Ring