Compatibility
- Stack height designation for EC headsets includes 10mm cup (see tech specs).
- Any frame that uses an external cup headset with a 34mm upper head tube inner diameter and 34mm, 44mm, or 49mm lower head tube inner diameter.
- Uppers and lowers sold separately.
- Enduro black oxide sealed bearings included on both the upper and lower.
- Upper headsets ship with a star nut which can only be used on forks with steel or aluminum steerer tubes. For forks with carbon steerer tubes you will need a compression plug (sold separately). (Never use a star nut on a carbon steerer tube).
- A crown race adapter (sold separately) will allow you to use forks with smaller 1-1/8″ or 1-1/4″ steerer tubes with a larger 1-1/2″ bottom headset cup
- EC34 Lowers are not compatible with Surly 1-1/8″ straight steerer forks
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