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Wolf Tooth headsets are machined in the USA with aircraft-grade 6061 aluminum. Our headsets have three levels of superior custom sealing to protect bearings from the elements and prolong the life of the headset. They are designed to be lightweight, strong, and durable. Available in a variety of colors. These EC headsets are for frames with external bearing cups, which places the bearing outside of the frame with these headsets. Premium Headsets with Enduro stainless steel bearings have a lifetime warranty.


  • Stack height designation for EC headsets includes 10mm cup (see tech specs).
  • Any frame that uses an external cup headset with a 34mm upper head tube. inner diameter and 34mm, 44mm, or 49mm 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).
  • A crown race adapter (sold separately)will allow you to use forks with smaller 1-1/8" or 1-1/4" steerer tubes with a larger 1-1/2" bottom headset cup

Upper assembly features:

  • Ultralight Stem Cap With Integrated Spacer plus an aluminum bolt and a star nut.
  • 5mm cover = 16mm total stack, 15mm cover = 25mm total stack, 25mm cover = 35mm total stack.
  • O-ring seal prevents water intrusion around the 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 to protect lower bearing in the toughest conditions.
  • 12.25mm stack.
  • Service and additional parts available.


The Wolf Tooth crown race installation adapter will help avoid damaging the crown race seals.

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Tech Specs

Weight: EC44 lower • 45g  |  EC49 lower •  54g  |  EC34 lower • 37g  | EC34 5mm upper • 64g  | EC34 15mm Upper • 70g  EC34 25mm upper • 79g
Material: 6061 aluminum
Stem Cap Bolt Torque Spec: 2-3 Nm with light grease on threads only

Made in the USA

Patent and trademark information

WARNING Handling this product will expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For further information go to