Note: As the White Industries catalogue is diverse, we don't stock every variant or colour. However, we place regular airfreight orders. If an item is in stock at White Industries, we can usually have it here within a week. Even if it's not in stock, they can often assemble it for us, and we can have it within three weeks at most. Feel free to get in touch if you're after something specific!

The ZS44│ZS56 headset is designed to fit frames with tapered 44mm/56mm head tubes and works with tapered 1-1/2” fork steerers. The “ZS” stands for “Zero Stack” as the section of the cup that houses the bearing sits inside of the frame’s head tube. The “44/56” stands for the top/bottom diameter of the “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.

Features

• U.S. sourced 6061-T6 aluminum

• Machine engraved White Industries logos 

• Easily replaceable 440C Stainless Steel Enduro bearings which feature a limited lifetime warranty

• “Split” crown race for tool-free installation and removal

• Really sweet matching headset spacers available separately

• Can accommodate “tapered 1-1/2” forks with a 40mm crown race seat

Specs 

• SHIS specification
  
  
  • Upper: ZS44/28.6
  
  
  • Lower: ZS56/40
  
  
  

• Stack height
  
  
  • Upper: 8mm
  
  
  • Lower: 4mm

• SHIS definitions on the Park Tools website: here

• Frame/Fork specs:

Frame upper head tube inside diameter	43.95mm to 44mm
Frame lower head tube inside diameter	55.9mm to 55.95mm
Fork steerer diameter top section	28.45mm to 28.6mm
Crown race seat diameter for  “straight 1-⅛”	30.015mm to 30.075mm
Crown race seat diameter for  “tapered 1-¼”	33.03mm to 30.09mm
Crown race seat diameter for  “tapered 1-½”	39.79mm to 39.85mm

Bearings

Headset Model	Upper Bearing (inner/outer angle)	Lower Bearing (inner/outer angle)	Lower Fork Race Compatibility
ZS44│ZS56	ACB3645SS 36/45	ACB6808CCSS 36/45	1-⅛” (30mm)  1-¼” (33mm)  1-½” (40mm)