If the noise is from a long section of the strap flapping in the wind on a flat surface at highway speed try covering that section with a foam tube water pipe insulator from home depot before you tighten up the strap.
Roof rack strap noise.
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Remove the straps when possible.
There are ways you can reduce noise from straps on a car roof and make the experience much better.
If the surface the wind passes over has a consistent shape the disturbance becomes tonal and at certain frequencies very annoying.
Set the item on the car roof.
5 taut straps sections in open air as opposed to the sections that are in contact with the carrier can hum whistle or vibrate.
Adding a 1 2 turn or a 1 turn twist to the noisy segment of strap will stop the noise.
In this article step 1 recommends removing the straps if you can step 2 suggests pulling them snugly and step 3 advises securing the ends of the straps.
The wind noise we hear from some roof racks is known as aeolian no ise and is produced by wind when it passes over or through objects.
You can also add weather stripping where the car and rack touch to reduce the friction and sound.
Hold down any loose carrier fabric with the straps.
Before you begin traveling pull the crossbars of your roof rack left to right to see if it s loose.
If the straps are loud then try removing them whenever it makes sense to do so.
A wind fairing s goal is to reduce the wind noises which are brought about by the roof rack you have placed in your vehicle.
Although wind fairings do not eliminate the noise 100 percent it does minimize it significantly to prevent you from being distracted while you are driving.
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The secret to reducing the noise from roof straps lies in the proper strapping technique.
A flimsily placed bike roof rack can meet your car and rub against it as your drive creating noise.
Reducing noise from straps.
Place the item you wish to carry squarely on top of your car s roof making sure it is centered both front to back and side to side.
6 tie and tuck the free ends of straps to keep them from flapping.
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