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EC Rear Steer U-Build-It Kit for Outlaw Race Mowers/Go Karts
605K Rear Steer U-Build-It Kit
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EC Rear Steer U-Build-It Kit for Outlaw Race Mowers/Go Karts

Part Number: 605K
Online Price: $299.99
605K Rear Steer U-Build-It Kit – Build Your Own Low-Profile Front Axle for FX-Class Racing Mowers
Availability: Out of Stock.

Description

605K Rear Steer U-Build-It Kit – Build-Your-Own Front Axle for Outlaw Race Mowers & Custom Karts


The 605K EC Rear Steer U-Build-It Kit provides the essential components needed to build a custom rear steer front axle, specifically designed for FX-class and outlaw-style racing lawnmowers, go-karts, and other performance chassis. This kit gives you the flexibility to create your own front-end geometry with a low-profile, race-ready setup.


Rear steer setups position the tie rods behind the axle beam, with both tie rods connecting directly to the pitman arm on the steering shaft—just like a go-kart. This configuration is commonly used in boxed-frame chassis with low ride heights, offering faster steering response and improved control for high-speed racing.


To complete your front axle, simply add a front beam, tie rods, and drag link based on your frame’s geometry. For USLMRA or ARMA classes, consider using one of our fully pre-assembled axles that meet specific rulebook specs.


Note: Spindles are not pre-machined for brakes. If you're planning to run front brakes, you’ll need to notch the spindle shafts for brake key installation.


Included in the 605K Kit:

  • 728 1/2" Heim Joints (undrilled)
  • 1/2"-20 Jam Nuts
  • 1/2"-20 Slotted Jam Nuts
  • FCRP-4053 Aluminum Caster End Plates
  • Steel Caster Back Plates
  • 1/2"-20 x 4.5" Hex Bolts (undrilled)
  • 12× 4066 1/2" x .154 Washers
  • 605 EC Rear Steer Spindle Set
  • 14× 2511 5/8" Radius Spindle Spacers
  • 5/8"-18 Slotted Jam Nuts
  • 999-31 Reusable Large Cotter Pins


Key Features:

  • Designed for rear steer setups in FX-class and outlaw racing mowers
  • Compatible with 5/8" front hubs (spindle shaft is 5/8")
  • Ideal for boxed-frame chassis and low-ride-height race mowers
  • Includes caster plates, spindle hardware, and spacers
  • Allows custom tuning of caster, camber, and steering angles
  • Suitable for go-karts or custom small-vehicle front ends
  • Rear-mounted tie rod configuration for go-kart-style handling


Recommended For:

  • Outlaw or FX-class racing lawn mowers
  • Go-kart chassis conversions
  • Builders seeking low-profile steering geometry
  • Racers using boxed or fabricated frames, not stock mower decks

FAQ

What’s included in the 605K Rear Steer Kit?

The kit includes rear steer spindles, aluminum and steel caster plates, 1/2" heim joints, spacers, washers, bolts, jam nuts, and reusable cotter pins. Full list above.


What else is needed to complete the axle?

You’ll need to supply your own front axle beam, tie rods, and drag link. This allows for custom sizing based on your chassis geometry.


What vehicles is this kit designed for?

The 605K kit is ideal for FX-class and outlaw-class racing lawnmowers, especially those using a boxed frame and lower ride height, as well as custom kart builds.


Can I add front brakes to this setup?

Yes, but the spindles are not pre-cut for brake keys. You’ll need to notch the spindle shafts to use front brakes.


What front hub size is this compatible with?

This kit is designed for use with 5/8" front hubs, which is standard across most racing mower and kart builds.

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