Specifications:

• Fits headtube internal diameter: Upper - 33.95mm: EC34
  Fits headtube internal diameter: Lower - 49.00mm: EC49
• Upper cup insertion depth: 12mm
  Lower cup insertion depth: 13mm
• Upper cup Stack height: 11mm - Total upper stack height including bearing cover: 16mm
  Lower cup Stack height: 14mm
• Upper Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing
  Lower Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing
• To suit tapered forks.
  If you are running a 1 1/8" fork you will need to purchase the reducer crown from the drop down menu - this headset comes as standard with a crown race to suit tapered 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 installation instructions > Click Here <