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.
Below 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, visit our products page.
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.
