Specifications:

• Fits headtube internal diameter: Upper - 33.95mm: EC34
  Fits headtube internal diameter: Lower - 33.95mm: EC34
• Upper cup insertion depth: 12mm
  Lower cup insertion depth: 12mm
• Upper cup Stack height: 11mm - Total upper stack height including bearing cover: 16mm
  Lower cup Stack height: 11mm
• Upper Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing
  Lower Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing
• To suit 1 1/8" forks.
• Split type 7075-T6  aluminium crown race for simple, tool free installation
   

We use the 'SHIS' standard to label our headsets - the numbers refer to the internal diameter of the headtube and the letters refer to the type of headcup: EC = 'External Cup' and ZS = 'Zero Stack'  - For more SHIS info please refer to the Park Tools information page  - Standardized Headset Identification System | Park Tool

Use our angle headset guide has information and guidance on choosing the right angle headset for you: Angle Headset Guide

For the installation instructions for our EC34 EC34:  > Click Here <