For up to date lead times please go here. Thanks!



SKU: ec34ec34
Clear Options


This style is often referred to simply as an “1-⅛” headset which, most of the time, is enough of a description to get you the correct headset.  But nowadays with all the different headset standards available we needed to get specific.

The EC34│EC34 headset is designed to fit frames with straight 34mm/34mm head tubes and straight 1-⅛” (28.6mm) fork steerers.  The “EC” stands for “External Cup” meaning the section of the cup that houses the bearing sits outside of the frame’s head tube and the “34” stands for the 34mm “skirt” that presses into the frame.

Note: As of 9/14/23, headsets will no longer include Star Nuts due to the Earth’s star nut overpopulation crisis. If you need one, they are available separately here.    



  • U.S. sourced 6061-T6 aluminum
  • Machine engraved White Industries logos 
  • Easily replaceable Enduro bearings
  • “Split” crown race for tool-free installation and removal
  • Really sweet matching headset spacers available separately
  • Compatible with Ritchey carbon 1-1/8″ steerer forks with integrated crown races (not tapered steerer forks)
    • Must call to purchase purchase additional bearing part #ACB45451125TSS which replaces the stock bearing and crown race
      • WCS road SKU 34356117005
      • WCS road SKU 34356117006
      • WCS Adventure Gravel SKU 34556117012
      • WCS Gravel Cross SKU 34556117010



  • SHIS specification
    • Upper: EC34/28.6
    • Lower: EC34/30
  • Stack height
    • Upper: 15mm
    • Lower: 12mm
  • SHIS definitions on the Park Tools website: here
  • Frame/Fork specs:

Frame upper head tube inside diameter

33.9mm to 33.95mm

Frame lower head tube inside diameter

33.9mm to 33.95mm

Fork steerer diameter top section

28.45mm to 28.6mm

Crown race seat diameter for

“straight 1-⅛”

30.015mm to 30.075mm



Headset Model

Upper Bearing (inner/outer angle) Lower Bearing 

(inner/outer angle)

Lower Fork Race Compatibility


ACB3645SS 36/45  ACB3645SS 36/45

1-⅛” (30mm)


Additional information

Weight N/A
Dimensions N/A
Head Tube

Top Steerer

Bottom Steerer / Crown Race


, , , , , , ,