Quadbar Flexi  

The ‘Quadbar Flexi’ TM has a flexible joint that allows the bar to flex rearwards in the inadvertent event of contact with an overhead obstacle.

The joint also facilitates some sideways flexibility before the joint locks and then becomes more of a traditional CPD meeting or ROPS.

Ingeniously, in the event of a rearwards overturn there is negligible movement from the flexi joint. US Pat. Appln. No. 16/392,485 Australian Pat. Appln. No. 2019202833

How Does The Quadbar Work?

The Quadbar is an Aluminum tube that is mounted to the back of the ATV via the tow hitch with support braces to the rear rack. The bottom mount is telescopic to allow height adjustment, and the rear rack attachment has guides which allow the bar to slide freely up and down and not interfere with the suspension. The Quadbar is engineered to allow full movement of the suspension and unobstructed use of the tow bar. 

What Does The Quadbar Do?

ATV's typically weigh about 660lbs (300kgs) and the installation of the Quadbar can reduce the risk of injury to the rider if the ATV were to land on the rider in the event of a rollover or side roll. The installation of the Quadbar can reduce this risk by creating a space between the ATV and the ground. "Research has identified injury caused by the pinning of the rider to be of particular concern. (ref: Risk and preventive factors for fatalities in All-terrain Vehicle Accidents in New Zealand, 2009. Boaz Shulruf, Andrew Balemi) Pinning injuries included: 

  • Death from asphyxiation - cutting of air supply.
  • Death from mechanical asphyxiation - inability to breathe due to forces (weight) on the body – can vary from minutes to hours.
  • Death caused by Crush Syndrome - toxins entering the blood stream when the "crush" cause is removed and circulation is restored.
  • Death from drowning – often in shallow water, whilst being pinned.
  • Death from heart failure – there have been a number of cases of roll over and pinning where the cause of death has been identified as heart failure (conjecture whether heart failure pre or post rollover)
  • Loss or reduced capacity of limb(s) – due to lack of circulation.


The tests for the backflip (or pitch) on a 20 degree or 36% slope, was set with considerable rearward momentum, enough to cause considerable handlebar and instrument damage and even bending to the steering columns. Forces of this magnitude have potential to cause serious or fatal injuries. The Quadbar was effective in arresting the backflip, with the quadbike rising on the hoop and falling to the side. Also injuries from quadbike backflips are particularly common. (ref Coronial Inquest – Melb) Testing has shown that the Quadbar can be effective in preventing a quadbike from rolling more than a 1/4 roll. For example during testing, the Yamaha Moto 250 completed 2 full rolls on a 20degree or 36% slope without a Quadbar, but only 1/4 of a roll with a Quadbar fitted. When the momentum is increased past the point when the Quadbar prevents more than a 1/4 roll, the testing showed that the quadbike continued to roll past ½ roll, and in most cases 3/4 roll to a full roll, which effectively reduces the chances of a quadbike pinning a rider. The momentum of the roll was also slowed and a space between the quadbike and the ground was maintained. 

Who is The Quadbar For?

The Quadbar is best for use that is generally considered safe, and the rollover is inadvertent.

Such as;

  1. Work place environments: examples include; Agriculture, mine sites, farms, forestry, parks board, security
  2. Commercial Tourism
  3. Some limited types of recreational use like touring

The Quadbar cannot be fitted to the "high performance" style ATVs where the operation is generally considered risky.


The designer of the Quadbar sought to reduce any adverse effects of the Crash Protection Device (CPD)

  1. Height of the Quadbar – is adjusted to sit below the riders head. This reduces the chance of the Quadbar being caught on low obstacles.
  2. Weight distribution –the top portion of the Quadbar is made with lightweight aluminum while the underside is heavier steel for strength, this results in a strong CPD with minimal effect on the center of gravity.
  3. Position of the Quadbar – is at the rear of the ATV, as far away from the rider as possible which reduces the chance of the rider coming in contact with the CPD. The Quadbar's position and narrow shape allow the rider to easily "exit" the ATV in an emergency situation. This position also allows the rider normal and unhindered mounting/dismounting.
  4. Padding and rounded shape – this is to reduce potential injury from inadvertent contact with the CPD and also allows the point of contact to slide as opposed to dig in during contact with the ground.


    • Rated for an ATV of up to 350 kg (790 lbs curb side mass)
    • Hoop - Aluminum tube
    • Upright -Steel
    • Horizontal variance between tow bar & rack 180 – 260 mm (7" – 10")
    • Total Overall height 1400 mm (55")
    • Approximate height above seat level 730 mm (29")
    • Weight 8 kg (approx. 17lbs)
    • Padding 9 mm (3/8") close cell UV stabilized
    • Fittings are laser cut for accuracy and consistency
    • Fittings are zinc plated

    The Quadbar fits:

      • Honda- All utility models 250cc and over*
      • Yamaha- All utility models 250cc and over*
      • Suzuki- All utility models 250cc and over*
      • Kawasaki- All utility models 250cc and over*
      • Kimco- All utility models 250cc and over*
      • Odes- All utility models 250cc and over*
      • Can-Am- All utility models up to 350 kg net weight*. Some models with optional rear bumper bar will require a rack extension plate and may be purchased as an accessory
      • Polaris- All utility models up to 350 kg net weight but for the 400 &500 models, an adaptor plate is available and may be purchased as an accessory. Contact QB Industries before ordering to ensure correct fit.

    *Excludes sports models. Fits utility models known to QB Industries up to a bare weight of 350 (770lbs) kg.


    The Quadbar is a bolt on attachment for most models. Generally one installation kit is all that's needed for most ATVs that are fitted with a tow bar & rack. However some of the less common ATVs may require variations of the brackets which may be purchased separately please see accessories.

    Professional installation of the Quadbar is recommended and usually takes approximately 30 minutes to install by an experienced mechanic.




    WorkSafe Supervisors - Manufacture and Farming TV advertisement

    University of Southern Queensland test sample

    Drop Test - With Quadbar CPD

    Drop Test - Without Quadbar CPD

    ABC - 7:30

    Opposition to Crush Protection

    Some year ago, there was some very poor research conducted into rollover protection on quads. This caused some to falsely believe that crush protection may not have significant value, and therefore oppose their use. The following video shows how appalling that early research was! More information on the subject can be found in the technical library.



    Technical Library

    Quadbar Manual

    Including safety, maintenance, fitting instructions, incident reporting, assembly manual, warranty and sales contract. View this document »

    Ridge Report

    In this research report Ridge Solutions looks at the engineering strength and energy absorption characteristics of the Quadbar TM. View this document »

    USQ Report

    The University of Southern Queensland Report looks at the roll dynamics of a quadbike with and without a Quadbar TM. View this document »

    Quad Bike Safety Devices

    ISCRR has undertaken a literature review at the request of WorkSafe Victoria, to assess the efficacy of a crush protection device which can be fitted to Quad bikes. Read More »