A common question we get at ARB revolves around the difference between GVM (Gross Vehicle Mass) And GCM (Gross Combinational Mass).  

In Australia, the GVM of a 4WD vehicle is the manufacturers maximum net weight of the vehicle. This figure includes the total weight of the car whilst empty, ball load of any trailer being towed, people, fuel, accessories and luggage. 

In contrast to this, the GCM accounts for the maximum combined weight of both the vehicle, and the trailer mass.

here is an equation to help better understand if you need a GVM Upgrade for you vehicle

Firstly find out your Factory Payload Capacity: 

Manufacturer’s GVM _____kg

LESS the Kerb weight of Vehicle _____kg  

= Factory Payload capacity _____kg

Lastly find out how much payload you actually have

Payload _____kg 

LESS Weight of passengers & driver _____kg 

LESS Additional liquids _____kg (Eg: extra fuel if fitted with long range tank, water, etc.)

LESS Accessories _____kg

LESS Luggage _____ kg 

LESS Trailer ball load _____kg

= Actual Payload

If you finish on a negative number, you’ll be over your Factory GVM.    

OME offers multiple Federally approved Pre-Registration GVM Upgrades for a variety of vehicles. To find out more about the OME GVM Upgrades please Click here.

At ARB We are frequently asked why we don’t do GCM Upgrades. 

As it stands, there is no federal approved legislation in Australia for an increase in GCM to a light vehicle. As a company, ARB is stringent in only offering Federally approved upgrades that are relevant for all states of Australia. The case for ARB to begin offering GCM upgrades relies on the legislation of Australia. GCM upgrades will be considered for development by ARB only in the case that changes are made, and if it is safe, reliable and federally approved.