The Enduro Angular Contact Headset Bearing is a high-grade replacement part specifically designed for integrated and semi-integrated 1 1/8" headset systems. Measuring 30.2mm x 41mm x 6.5mm, this bearing is engineered to provide a rock-solid, play-free steering interface. Unlike standard industrial radial bearings, the Angular Contact (ACB) design is purpose-built for the unique stresses of cycling, where the bearing must simultaneously handle the vertical weight of the rider and the lateral forces of steering and cornering.
This model features a hybrid 36° internal and 45° external chamfer. This specific angular combination is a common standard for many high-end road and mountain bike frames, ensuring the bearing centers itself perfectly within the head tube and mates flush with the fork’s compression ring. Constructed with high-carbon chromium steel and Grade 10 precision balls, it restores that "new bike" steering feel while offering significantly better durability than generic original equipment.
36° x 45° Hybrid Geometry: Engineered with a 36-degree internal angle for a precision fit on the compression ring and a 45-degree external angle to seat perfectly in the frame's head tube.
52100 High-Carbon Steel: Forged and vacuum-degassed chromium steel races provide a hard, mirror-smooth surface that resists "brinelling" (the permanent indentations that cause notchy steering).
Grade 10 Precision Balls: Features balls that are spherical within 10/1,000,000", ensuring even load distribution and reducing internal friction for effortless steering.
Dual-Lip Labyrinth Seals: High-contact seals create a redundant barrier that effectively keeps road grit, dust, and moisture out while locking in the essential factory grease.
High-Fill Waterproof Grease: Factory-packed with specialized marine-grade lubricant designed to resist wash-out and stay in place even during high-vibration off-road riding.
ABEC 3 Tolerance: Manufactured to higher precision standards than basic industrial bearings, resulting in a quieter, smoother rotation and longer service life.
| Feature | Specification |
| Dimensions | 30.2mm (ID) x 41mm (OD) x 6.5mm (W) |
| Contact Angle | 36° Internal / 45° External |
| Material | 52100 High-Carbon Chromium Steel |
| Bearing Type | Angular Contact (ACB) |
| Seal Type | Dual-Lip High-Contact |
| Precision Grade | ABEC 3 |
Owners of 36° Compression Systems: If your headset uses a 36-degree compression ring (common on many performance road and gravel forks), this specific hybrid angle is required for a secure, creak-free fit.
Restoring Steering Smoothness: The perfect solution if your steering feels "indexed" or stuck in the center, or if you have developed front-end play that a standard adjustment won't fix.
Value-Focused Performance: Offers professional-level tolerances and superior sealing at a price point that makes it an easy choice for regular maintenance.
Standard 45° x 45° Headsets: If your headset is designed for a 45-degree internal angle, this 36-degree bearing will not seat correctly, leading to accelerated wear or damage to your fork steerer.
Extreme Corrosive Environments: While highly durable, this is a steel bearing. For riders in coastal areas or those who train heavily indoors, the Enduro Stainless Steel version of this size offers the ultimate protection against rust.
The 36° internal angle is the critical spec here. Before installation, check the laser-etched text on the side of your old bearing to confirm the angles match. When installing, apply a generous amount of waterproof assembly grease to the chamfered edges and the internal head tube seat. This creates a "gasket" that keeps water away from the bearing and prevents the annoying "creaking" often associated with modern carbon frames. Tighten your top cap just until the play disappears—over-tightening is the primary cause of premature bearing failure!
