34 × 64 × 37 Sealed Wheel Bearing

The TRE 34mm Modular Wheel Hub System gives Formula SAE, Formula Student, Baja, and other custom vehicle designers a compact, standardized wheel-bearing and drivetrain core while leaving the wheel and brake interface open for the team to design around its own car.

Rather than starting with a blank sheet and developing the bearing arrangement, retention system, drive interface, wheel flange and brake interface simultaneously, teams can start with a complete TRE-developed wheel hub architecture and concentrate their design work where it matters to their vehicle.

The bearing system and critical hub geometry are standardized by TRE. The wheel and brake interface is yours to design.

Three Configurations

Freewheel Hub — Non-Driven

The freewheel version is intended for non-driven corners and uses a lightweight aluminum or steel hub with the same 34 × 64 × 37 sealed bearing architecture as the driven systems.

This is a simple and light configuration for a non-driven wheel.

Best for:

• Front wheels on rear-wheel-drive cars
• Lightweight non-driven corners
• Teams wanting a common bearing and upright philosophy across the vehicle

[DOWNLOAD STEP — 34mm FREEWHEEL HUB ASSEMBLY]

22T Splined Drive Hub

The 22T version uses a female-splined driven wheel hub with a matching splined stub shaft.

Drive torque passes from the tripod or CV assembly through the stub shaft and spline directly into the wheel hub while maintaining the same compact sealed-bearing architecture.

This configuration provides a conventional, serviceable separation between the wheel hub and the outboard drivetrain housing.

Best for:

• Driven wheels using a separate tripod or CV housing
• Teams wanting a removable stub shaft
• Applications where the outboard joint and wheel hub should remain separate service components

[DOWNLOAD STEP — 34mm 22T SPLINED DRIVE HUB ASSEMBLY]

10T Tulip Drive Hub

The 10T version uses a splined drive interface designed to accept TRE slip-on tulip housings, the same housings and spline used on our differentials.

This architecture makes the outboard tripod housing interchangeable instead of making it a permanent part of the wheel hub. Teams can select different TRE tulip sizes and materials to suit their drivetrain requirements while retaining the same wheel hub and bearing core.

The result is a particularly flexible system for teams developing or evolving their drivetrain over multiple seasons.

Best for:

• FSAE tripod drivetrains
• Teams wanting interchangeable outboard tulips
• Applications where tripod size, material or configuration may change

[DOWNLOAD STEP — 34mm 10T TULIP DRIVE HUB ASSEMBLY]

Designed Around Your Wheel and Brake Package

The outboard end of each TRE modular hub is intentionally provided as a configurable design region rather than forcing the team into a predetermined wheel bolt pattern, brake rotor, or wheel offset.

Within the approved design envelope outboard of the bearing, teams can define features including:

• Wheel bolt or stud pattern
• Center pilot diameter
• Wheel mounting-face location
• Brake rotor bolt pattern
• Rotor pilot
• Rotor offset
• Flange outside diameter and profile
• Appropriate lightening geometry

This allows the same TRE hub architecture to work with many different 10-inch, 13-inch and other FSAE wheel and brake packages.  You can manufacture the hubs yourself, partner with a local machine shop, or have TRE manufacture your fully customized wheel hubs.  We recommend using our custom manufacturing services to achieve the best overall fit and function as we specialize in this application, but from an educational standpoint we always want students to experience manufacturing yourselves so you can understand the challenges, risks, costs, etc.  We offer engineering consultation to support your efforts, regardless of if we build the parts or if you do.  

Standard Core. Custom Interface.

TRE retains control of the geometry that makes the system work:

• Bearing fits and shoulders
• Hub retention
• Spline geometry
• Critical structural transitions
• Minimum wall sections and fillets
• Drive-interface geometry

The team designs the vehicle-specific outer interface.

For custom production parts, send TRE your completed wheel-interface model for review before manufacture.

Why Use a Standardized Hub System?

Wheel hubs are deceptively difficult components. They combine wheel loads, brake loads, drive torque, bearing fits, retention, fatigue, stiffness, manufacturing tolerances and packaging into one small assembly.

The TRE Modular Hub System lets student teams spend their engineering effort integrating the corner into their car without having to reinvent every detail of the wheel-bearing system.

One platform can support:

• Driven and non-driven corners
• Multiple drivetrain architectures
• Multiple brake systems
• Multiple wheel patterns
• Custom wheel offsets
• Future drivetrain changes

STEP Assembly Downloads

Download the complete assemblies before beginning your upright, wheel or brake design.

34mm Freewheel Assembly
[DOWNLOAD STEP]

34mm 22T Splined Drive Assembly
[DOWNLOAD STEP]

34mm 10T Tulip Drive Assembly
[DOWNLOAD STEP]

The STEP assemblies are provided as packaging and integration models. Contact TRE before modifying any bearing, spline, retention or other controlled core geometry.

Available as a Custom or Factory Configuration

Custom Interface

Start with the TRE STEP assembly and design your own wheel and brake interface. TRE can manufacture the finished hub from your approved configuration.

TRE Factory Designs

TRE will also offer selected complete configurations using predefined wheel bolt patterns, brake rotor interfaces and hardware.

Factory configurations are ideal for teams that want a proven complete wheel-end package rather than developing the wheel and rotor interface themselves.

Need Help Choosing a Configuration?

Contact us to schedule an engineering consultation.  We can review:

• Wheel model
• Brake rotor and caliper
• Upright concept
• Tripod or CV selection
• Driveshaft arrangement
• Vehicle mass and expected loads

TRE can help determine which hub and drivetrain architecture makes the most sense for your car.