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Trifecta Pre-Adjusted Hub Assembly

The New Standard In Fast, Reliable Wheel End Installation.

The STEMCO Trifecta Pre-Adjusted Hub Assembly combines premiere STEMCO wheel end technologies with the trusted Webb® hub in a single, pre-adjusted assembly, ensuring a faster and more secure installation.  Trifecta eliminates the need to purchase, install and adjust separate wheel end components and fasteners while guaranteeing reliability.


  • Provides quick and easy installation with no bearing adjustment required.
  • Includes Zip-Torq® axle fastener featuring a unitized design with no additional clips, keepers, snap rings or screws, increasing simplicity for technicians.


  • Discover® XR is a high-performance seal that provides quick and easy installation and long life.  The seal ID includes patent-pending GlideLock technology,  significantly reducing installation force by 50% with no prelube required— the first of its kind in the industry.  
  • The Discover XR seal utilizes a 4-zone labyrinth and slinger, combined with a Defender ESP hub cap, providing unmatched contamination exclusion.
  • STEMCO manufactured precision bearings exceed ABMA performance and durability standards, and are included in OEM long-life wheel end systems.


  • Features industry-standard components manufactured by STEMCO & Webb Wheel.
  • Backed by STEMCO support nationwide, including on-site training and certification, TMC-approved procedures and a 5-year/500,000 mile parts and labor OEM warranty.

Simple Installation. Total Peace of Mind. 

Designed for fleets that value component longevity between service intervals and keeping time in the service bay as brief as possible, the Trifecta hub assembly represents the peak of durability and simplicity—the toughest, most resilient wheel end components united in an easy-to-install package.

1) Webb Wheel Hub

  • Industry-standard hubs
  • Precision machined for Trifecta
  • Ductile iron & aluminum options available
  • Over 70 years of hub expertise

2) Discover XR Seal

  • High-temperature, long-life seal
  • 4-zone labyrinth and slinger providing unmatched contamination prevention
  • GlideLock patent-pending technology - glides on, self-locking, 50% reduced installation force
  • No prelube required, eliminating the industry’s #1 cause of seal failure

3) STEMCO Manufactured Bearings

  • Exceed ABMA performance and durability standards
  • Included in OEM long-life wheel end systems

4) Defender ESP Hub Cap

  • Made from high-strength composite material
  • 100% corrosion-free 
  • ESP (Extended Service Plug) prevents contamination from entering, protects lubricant integrity  

5) Zip-Torq Axle Fastener

  • Simplified, one-piece advanced axle fastener provides fast and simple installation  
  • Self-ratcheting feature prevents back-off
  • No clips, keepers or set screws to install
  • Easy removal

6) STEMCO Spacer (patent-pending)

  • Designed for optimized lubricant flow 
  • Reduces fret corrosion between spindle and bearing mating surfaces
  • Extends spindle, bearing and seal life 


For more information about the Trifecta Pre-Adjusted Hub Assembly, contact a STEMCO sales representative or find your nearest STEMCO distributor.