IS41-IS52 Headset

IS41/IS52 Headset

$137.00

The White Industries IS41 | IS52 Threadless Headset combines precision machining, premium Enduro stainless steel bearings, and a split crown race for smooth steering and easy service. Built in Petaluma, California.

SKU: is41is52
Category:

Description

The White Industries IS41 | IS52 Threadless Headset delivers smooth steering, lasting durability, and timeless style for modern bicycles. We machine, polish, engrave, and inspect every headset in our Petaluma, California facility. As a result, the IS41 | IS52 offers the premium craftsmanship and dependable performance riders have trusted for decades.

For more than 30 years, White Industries has designed components that prioritize precision, reliability, and serviceability. The IS41 | IS52 Threadless Headset continues that tradition with premium materials, thoughtful engineering, and a clean, refined design built to last.

Every headset features premium Enduro stainless steel angular contact bearings for smooth, consistent steering in all riding conditions. These bearings are fully replaceable, making routine maintenance quick and easy while extending the life of your headset.

The IS41 | IS52 also features our split crown race design. It installs and removes by hand without specialized tools, making future service simple. In addition, every headset receives precision machine-engraved logos—not laser etched—for a premium finish that reflects the attention to detail found in every White Industries component.

The White Industries IS41 | IS52 Threadless Headset is designed for frames with integrated 41mm upper and 52mm lower head tubes. It is compatible with tapered 1-1/2-inch (40mm) fork steerers, making it an excellent choice for many modern mountain, gravel, and road bike frames that use an integrated tapered headset system. Because headset standards vary between manufacturers, we recommend confirming your bike’s SHIS (Standardized Headset Identification System) specifications before placing your order to ensure the correct fit.

Whether you’re upgrading an existing bike or completing a custom build, the White Industries IS41 | IS52 Threadless Headset delivers smooth performance, premium craftsmanship, and American-made quality built to last.

Features

  • Precision CNC-machined in Petaluma, California
  • Designed for IS41 | IS52 integrated headset applications
  • Compatible with tapered 1-1/2-inch (40mm) fork steerers
  • Premium Enduro stainless steel angular contact bearings
  • Replaceable bearings for long-term serviceability
  • Split crown race for easy installation and removal
  • Precision machine-engraved White Industries logos
  • Durable, easy-to-service design
  • Smooth, reliable steering performance
  • Made in the USA

Technical Documents

Looking for more detailed technical info? Visit our Technical Documents page here.

Specs

  • 6061-T6 aluminum
  • Machine engraved logos 
  • Easily replaceable Enduro stainless steel angular contact bearings
  • “Split” crown race for tool-free installation and removal
  • Stack height
    • Upper: 8mm
    • Lower: 1mm
  • Weight

Compatibility

  • A perfect match to our really sweet matching headset spacers, available separately
  • The IS41│IS52 headset is designed to fit frames with integrated tapered 41mm top/52mm bottom head tubes and tapered 1-1/2″ (40mm) fork steerers
  • The “IS” stands for “Integrated System” meaning the bearings drop directly into the head tube, without the traditional style “headset cup” that would press into the frame, and the “41”and “52” refer to the outer diameter of the upper and lower bearings, respectively.
  • SHIS specification
    • Upper: IS41/28.6
    • Lower: IS52/40
  • Not compatible with carbon forks that have integrated crown race seats
  • 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

    43.95mm to 44mm

    Fork steerer diameter top section 

    28.45mm to 28.6mm

    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  

IS41│IS52

 ACB3645SS 36/45 ACB6808CCSS 36/45

1-1/2” (40mm)

What's In The Box

  • One headset which includes:
    • Top cap bolt
    • Top cap
    • Bearing cover
    • Upper bearing compression ring
    • Upper bearing
    • Upper cup
    • Lower cup
    • Lower bearing
    • Crown race
  • Headsets no longer include Star Nuts due to the Earth’s star nut overpopulation crisis. If you need one, they are available separately here.

FAQ

Will this headset fit my bike?

You will need to do some homework and get the SHIS specs of your frame and fork which those manufacturers will have.  See those definitions here.  Also see the “Compatibility” section on this page.  Simply telling us what model bike you have may not be enough info to go on.  Help us help you and get the specs!

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