Wolf Tooth Premium ZS Headsets - Zero Stack Info

Wolf Tooth Premium ZS Headsets – Zero Stack are engineered for riders who demand long-term durability, precise steering feel, and refined finishing details. Machined in-house in Minnesota from aircraft-grade 6061 aluminum, these Zero Stack headsets are designed to be lightweight, strong, and exceptionally well sealed against the elements.

The ZS (Zero Stack) configuration is intended for frames with internal bearing cups pressed into the head tube. With compatibility for 44mm upper and 56mm lower head tube inner diameters, the Wolf Tooth Premium ZS Headsets offer a clean, integrated look while maintaining easy serviceability. Uppers and lowers are sold separately, allowing you to match your exact frame requirements and color preference.

At the core of this Premium ZS Headset are Enduro stainless steel sealed bearings, backed by a lifetime warranty. These bearings are protected by three levels of custom sealing, including an O-ring around the steerer tube and a molded upper lip seal to defend against water intrusion. The lower assembly features a dual-lip crown race seal designed to shield the lower bearing from mud, grit, and harsh riding conditions.

Wolf Tooth Premium ZS Headsets – Upper Assembly Features

Integrated Top Cap: Ultralight stem cap with integrated spacer.
Stack Height Options: 6mm, 15mm, and 25mm top cover choices.
Sealing: O-ring seal at steerer tube plus custom-molded upper lip seal.
Hardware Included: Aluminum bolt and star nut (for steel or aluminum steerer tubes only).

Lower Assembly Features

Dual-Lip Crown Race Seal: Enhanced protection for lower bearing in demanding conditions.
Enduro Stainless Bearings: Sealed and covered by a lifetime warranty.
Precision Machining: All components produced in-house from aircraft-grade aluminum.

Technical Specifications

Material: 6061 aluminum
Weight: 55–58g (varies by configuration)
Bearing Bevel Angle: 36° x 45°
Stem Cap Bolt Torque: 2–3 Nm (light grease on threads only)
Compatibility: ZS frames with 44mm upper and 56mm lower head tube inner diameter

Installation Notes

The included star nut is designed for steel or aluminum steerer tubes only. Never use a star nut with a carbon steerer—use a compression plug instead (sold separately). For optimal installation and to avoid damaging crown race seals, Wolf Tooth recommends using a dedicated crown race installation adapter.

Final Take

The Wolf Tooth Premium ZS Headsets – Zero Stack combine meticulous machining, industry-leading sealing, and premium stainless bearings into a headset built for serious riders. Whether you're upgrading a performance road build, a gravel bike, or a trail machine, this Zero Stack headset delivers smooth steering, lasting protection, and a refined finish that elevates any frame.