What is the weight limit for roof loads when driving?

Go to Pro-rack to identify your vehicle and the weight rating of the roof racks:

http://www.prorack-international.com/nz/Find-my-car/  

 

The weight limit when driving is imposed by the vehicle manufacturer for safety reasons.
Adding a load to the roof of your vehicle increases the “swaying” when cornering.

This acts like a pendulum and there is a limit that the vehicles suspension is designed to take.

This load is far less than the roof rack load when stationary.

So although there is a roof rack load rating on each roof rack, the vehicle load is the first one to check on.

For example some models of the Kia Brand have limitations of 45kgs. Typically most cars are around 50-70gs and 4WDs can be much higher.

The Static load for your vehicle is calculated as follows:

For Pro Rack roof racks who manufacture to the Australian Standard, the Testing Static Load is FOUR times the Dynamic Load

So if the Rating is 75kgs then these racks WITH FIXED POINTS on the vehicle will take a static (sleeping load) safely of 300kgs.

Racks that use gutters or clamp and are gutterless will take less depending on how acurately and carefully the racks are attached to the vehicle.

We recommend you have your rack selection inspected and verified by you Roof Rack Provider.