4WD World is a Major Australian Distributor of Thor Air Bag Suspenion

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We Are Your Airbag Suspension Specialists For All Major Makes And Models.

Polyair Spring Suspension

Polyair Bellows – Airbag Assist Suspension

The Polyair Bellows load assist kits are specifically designed to suit leaf sprung vehicles.

When you load up the back of the vehicle or hook up a caravan / trailer, you’ll notice the rear end drop down, this drop in height can have some adverse effects on your vehicle’s safety and handling.

Symptoms such as:

  • Suspension bottoming out
  • Rough ride
  • Excessive sway & body roll
  • Unpredictable braking characteristics
  • Poor headlight aim
  • Clearance issues

All this can be mitigated by installing a set of Polyair Bellows. The Bellows kit is air adjustable giving you flexibility to tailor the level of support for your individual load types and weights.

Having a correctly sprung vehicle for constant loads is always recommended as the first step, but in most cases the leaf springs are rated well past what you will carry daily, giving you a rough, uncomfortable ride when not loaded up.

Having the flexibility of the adjustable Polyair Bellows means you can have a smooth stock ride comfort when unloaded and simply adjust the pressure when towing or hauling. Simple.


  • Air adjustable from 5-100psi
  • Built with a superior 2-ply fabric reinforced rubber
  • Ultra high strength & corrosion proof Zytel ® Nylon end caps
  • Most popular kits do not require drilling into the chassis
  • Easy to install with illustrated instructions
  • Quick connecting, easy to use air fittings.
  • Kits designed for standard height and raised applications
  • Bespoke design for each vehicle

Benefits of the Bellows Kit:

  • Maintains proper ride level for heavy loads
  • Renews life in tired springs
  • Adjustable to suit the relevant load
  • Makes vehicles safer to drive when laden


Polyair Cradle Kit / Articulation Kit

Its simple design allows the Polyair Bellows Series Airbag to detach from the cradle to allow full travel of the suspension. When back on level ground the bellow will comfortably and safely sits back into the cradle. This cradle is ideal for the regular off-roader.

The Polyair Cradle is designed to suit all of our Bellow series bags and installing them to an existing kit is easy!

These kits give your 4WD vehicle greater wheel articulation making it a more capable 4WD vehicle without sacrificing ride quality.

These are popular for heavily laden Landcruiser 79/78 utes, plus Ford Ranger, Hilux, Navara and other popular 4WD models.

Freecall Airbag World on 1800 807 176 or get your quote below

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