Enduro Headset Bearing ACB 4545 137 - Stainless

Enduro Headset Bearing ACB 4545 137 - Stainless Enduro

Enduro Headset Bearing ACB 4545 137 - Stainless

Enduro Headset Bearing ACB 4545 137 - Stainless

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Why Does the Enduro ACB 4545 137 Stainless Headset Bearing Matter?

The Enduro Headset Bearing ACB 4545 137 is a precision angular contact bearing built for headset applications where steering feel and longevity are equally important. The 45/45 angular contact design manages both radial and axial loads at once, handling the combined steer forces and front-wheel braking loads of aggressive riding. Machined from stainless steel, the races resist corrosion and maintain smooth rotation through mud, water, and repeated washing without the pitting and roughening that chrome steel develops over time.

A worn headset bearing filters every bit of steering feedback through a rough, inconsistent contact point between fork crown and head tube. The stainless construction is well suited to riders in wet-climate regions, commuters, and indoor trainer athletes where moisture is a constant headset reality. Whether you are doing a fresh build or restoring creak-free steering on an established bike, the ACB 4545 137 is the correct bearing for the job.

$37.67
$37.67
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1 in stock

  • Orders over $100 ship free!
  • Estimated delivery: Aug 08 - Aug 12

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Specifications

  • Bearing Type: Angular Contact Bearing (ACB)
  • Contact Angle: 45/45 degrees
  • Size Designation: 137
  • Race Material: Stainless steel
  • Application: Headset cups, fork crowns
  • Load Handling: Radial and axial (combined)

FAQ

What does ACB mean on a headset bearing?

ACB stands for Angular Contact Bearing. Unlike standard radial bearings, ACB bearings are designed to handle both radial and axial loads, making them the correct design for headset applications where steering and braking forces push in multiple directions.

Why choose stainless races for a headset bearing?

Stainless steel resists corrosion where chrome steel races would rust and pit under sustained moisture exposure. For headsets on wet-climate bikes or trainer setups, stainless races dramatically extend service life and maintain smooth steering feel longer.

What does the 4545 designation mean?

The 4545 refers to the 45-degree contact angle on both faces of the bearing. This symmetrical geometry provides balanced load handling for typical headset applications and is the most common ACB specification in modern bicycle headsets.

Best For

Riders in wet-riding regions rebuilding headsets on trail, all-mountain, or gravel bikes where corrosion is an ongoing concern. Also a smart upgrade for any quality build where a headset bearing needs to handle moisture and heavy use without short service intervals.

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