Thule's 421 Xsporter rack system mounts on the bed rails of your truck, and accommodates various Thule carriers and loads. The rack's two load bars can be raised and lowered — great for loading and unloading bikes, short boards, or snow boards from your carrier. Raise your cargo up, and you can use your truck bed for storing other items.

Swift-looking aerodynamic-styled Rapid Aero™ load bars handle loads up to 450 pounds. You can lock the rack with one key for added security. All Thule equipment passes tough European safety standards for car racks.

Product Highlights:

  • two load bars with four supports
  • mounts on rails of truck bed
  • four rack locks included
  • weight capacity: 450 lbs.
  • warranty: limited lifetime
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

  • 2 Right-side upright support assemblies
  • 2 Left-side upright support assemblies
  • 4 Right-side base angle endcaps
  • 20 Self-tapping screws
  • 4 Left-side base angle endcaps
  • 2 Right-side upright support upper endcaps
  • 2 Left-side upright support upper endcaps
  • 2 Right-side upright support lower endcaps
  • 2 Left-side upright support lower endcaps
  • 2 Right-side clamp handle assemblies
  • 2 Left-side clamp handle assemblies
  • 4 Locks
  • 4 Pivot-pins (pre-installed)
  • 4 Upright rail assemblies
  • 4 Upright rail endcap
  • 2 Crossbars
  • 4 Crossbar endcaps
  • 4 Self-tapping screws (pre-installed)
  • Eight 10mm T-bolts
  • Eight 10mm washers
  • Eight 10mm nuts
  • 4 Crossbar strips
  • 8 C-clamp assemblies
  • Eight 10mm clamp bolts
  • Eight 10mm jam nuts
  • 8 Clamp head channel
  • 4 Slot cover
  • Change key
  • 4 Locking keys
  • 4 Load stops
  • 4 Knobs
  • 4 T-bolts
  • 4 Washers
  • Installation Instructions

Product Research


Overview: The Thule 421-Xsporter medium-duty rack system designed to maximize the load capacity of select pickup trucks. The 421-Xsporter features long lasting, great looking high strength aluminum construction. The Thule medium-duty rack system can accommodate a load capacity of 450 lbs. The length of the cross bar is 71", while the height from the bed rail to the top of the cross bar is 25". You can raise the load bars to carry long loads or lower them for convenient bed level loading. The 421-Xsporter offers versatile aerodynamic load bars to accommodate Thule carriers. This Thule rack system features a locking system which includes four locks and one key. The 421-Xsporter rack system is easy to install with no drilling required.

Note: Excessive rust in truck bed decreases carrying capacity and could result in system failure. Vehicles with bed liners could require modifications.

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