Wolf Tooth Premium EC Headsets - External Cup Info

Wolf Tooth Premium EC Headsets – External Cup are precision-machined in the USA from aircraft-grade 6061 aluminum and engineered for riders who demand long-term durability, precise steering, and refined color-matched detail. Designed for frames that use external bearing cups, these EC headsets position the bearings outside the head tube for classic fit standards with modern sealing performance.

What sets Wolf Tooth headsets apart is their triple-layer sealing strategy. From O-ring protection at the steerer interface to custom-molded lip seals and dual-lip crown race protection, each component is built to shield the bearings from water, grit, and trail debris. Inside, premium Enduro stainless steel sealed bearings provide smooth rotation and carry a lifetime warranty—because a headset should be the last thing you worry about on a ride.

Available in multiple anodized colors, these Premium EC Headsets deliver both mechanical precision and a clean aesthetic upgrade for custom builds, restorations, or performance-focused projects.

External Cup Design & Compatibility

Headset Type: EC (External Cup) – bearings sit outside the head tube.
Upper Compatibility: Frames with 34mm upper head tube inner diameter (EC34).
Lower Compatibility: 34mm, 44mm, or 49mm lower head tube inner diameter options.
Bearings: Enduro stainless steel sealed bearings (lifetime warranty).
Bevel Angle: 36° x 45°.
Material: CNC-machined 6061 aluminum.
Made in: USA.

Note: Uppers and lowers are sold separately. Stack height designation includes a 10mm cup.

Upper Assembly Features

Integrated Stem Cap + Spacer: Ultralight design with aluminum bolt and included star nut.
Cover Options: 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 Upper Lip Seal: Additional bearing protection.
Stem Cap Bolt Torque: 2–3 Nm with light grease on threads only.

Important: Upper assemblies ship with a star nut for steel or aluminum steerer tubes only. Never use a star nut on a carbon steerer tube—use a compression plug instead (sold separately).

Lower Assembly Features

Dual-Lip Crown Race Seal: Protects the lower bearing in wet and muddy conditions.
Lower Stack Height: 12.25mm.
Weight: EC34 lower – 37g | EC44 lower – 45g | EC49 lower – 54g.

EC34 lowers are not compatible with Surly 1-1/8” straight steerer forks. A crown race adapter (sold separately) allows use of smaller 1-1/8” or 1-1/4” steerer tubes with a larger 1-1/2” lower headset cup.

Why Choose the Premium EC Headset

Advanced Sealing System: Three layers of protection for long bearing life.
Precision Machining: Tight tolerances ensure smooth steering and proper preload.
Lifetime Bearing Warranty: Enduro stainless bearings built for the long haul.
Custom Finish Options: Wide color selection for a refined build aesthetic.

Final Take

The Wolf Tooth Premium EC Headsets – External Cup offer the reliability of classic external cup standards with modern sealing technology and USA-made precision. For riders building a bike that deserves long-term performance and thoughtful detail, this headset is a dependable, high-quality foundation.