Wolf Tooth Wolf Tooth Premium Zero Stacks Headsets (ZS)

Compatibility
• Any frame that uses ZS (Zero Stack) headsets with 44mm upper and 56mm lower head tube inner diameter.
• Uppers and lowers sold separately.
• Enduro stainless steel 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).

Upper assembly features:
• Ultralight stem cap with integrated spacer plus an aluminum bolt and a star nut.
• 6, 15 and 25 mm stack height top cover options (6mm cover = 6mm total stack, 15mm cover = 15 total stack, 25mm cover = 25mm total stack).
• O-ring seal prevents water intrusion around steerer tube.
• Custom-molded upper lip seal provides additional protection for upper bearing.

Lower assembly features:
• Custom-molded dual-lip seal on the crown race protects lower bearing in the toughest conditions.
• All components precision machined in-house at Wolf Tooth from aircraft grade aluminum to ensure the highest level of quality.
• Service and additional parts available.
• Stem Cap Bolt Torque Spec: 2-3 Nm with light grease on threads only
• Made in the USA