Having installed hundreds of roof racks i can tell you from experience it is the vehicle and where the bar is positioned on the vehicle that creates noise not the actual shape of the bar.
Roof rack making noise.
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Often there is a notation on the rails that warn you not to position a crossbar forward of a certain position.
Set the item on the car roof.
Put a twist on the side of each strap to dampen noises when your car is in motion.
Examine if there is any contact made between the rack or its accessories and the surface of the vehicle.
Most manufacturers have one in their product line up.
It s best if you can incorporate 2 x 6 material and use large timber screws instead of nails.
This breaks up the vorticies that create the whistling noise in the first place and is easier than repositioning your rack.
Get a foil bar.
Make sure to keep the support towers secured by tying down its straps and.
You can also wrap some 1 4 to 3 8 rope in a spiral around both bars.
Mines starts roaring and getting annoying when i get up to.
Most people get their kayak or clamshell storage unit secured and then in their eagerness to get on the road leave the job incomplete.
There are a few ways you can go about this.
One of the most common sources of noise from roof straps is the extra length of strap that is loose after an object has been secured.
The solutions wind fairing.
The new aero foil cross.
Most of the premium racks comes with some type of textured rubber insert that disturbs the airflow.
Look at factory crossbars.
I ve stopped these noises from happening in homes by adding diagonal bracing to the roof rafters or trusses.
The first option is to add a wind fairing.
Here are some steps that will help you deal with this concern.
Like the rack itself unsecured bikes and accessories can create noise as they bounce around.
Place the item you wish to carry squarely on top of your carĂ¢ s roof making.
You want to place at least two 4 inch long timber screws through the 2 x 6 where it passes over the underside of the roof rafter or truss.
Check the base roof rack of your vehicle.
If your vehicle has a roof rack with a cross member then you know it gets noisy one the highway.