Description
The following versions of the headset are available:
Upper part:
- EC44 | 28,6 – fits frames with upper head tube diameter 44 mm and forks with an upper steerer tube diameter of 28.6 mm (1 1/8 inch)
- EC49 | 28.6 – fits frames with upper head tube diameter 49 mm and forks with an upper steerer tube diameter of 28.6 mm (1 1/8 inch)
- ZS56 | 28,6 – fits frames with upper head tube diameter 56 mm and forks with an upper steerer tube diameter of 28.6 mm (1 1/8 inch)
Lower part:
- EC49 | 30 – fits frames with lower head tube diameter 49 mm and forks with a lower steerer tube diameter of 30 mm (1 1/8 inch).
- ZS56 | 30 – fits frames with lower head tube diameter 56 mm and forks with a lower steerer tube diameter of 30 mm (1 1/8 inch).
- EC56 | 40 – fits frames with a lower head tube diameter of 56 mm and forks with a lower steerer tube diameter of 40 mm (1 1/2 in.)
You can also find an overview of the versions in our Tech Guides:
You do not know what diameter is your steerer tube and your head tube? Here we have put together a little guide on how you can measure:

FIT GUIDE: MEASURING STEERER TUBE AND HEAD TUBE
You do not know which headset version you need? We have compiled a small How-To for you, how you measure your steerer tube and head tube of your frame correctly and which headset version fits.
You can find the full description of the headset here.
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