Why do some roof boxes create more wind noise than others?

Why do some roof boxes create more wind noise than others? 

If you’ve ever driven with a roof box, you know the sound: a low hum or a constant whistle at highway speeds. But why do some boxes make more noise than others?

It’s all about aerodynamics

Roof boxes sit outside the car’s natural airflow. Their shape, length, and mounting system all affect how air moves around them. A less aerodynamic design can create turbulence, leading to increased noise in the cabin.

Speed matters

At higher speeds, air pressure and turbulence increase, which means that even small differences in box design can make a big impact. Long and flat roof boxes often generate more noise compared to shorter, aerodynamic ones.

Rear mounted boxes: the quiet alternative

Towbar mounted boxes, like IXTAbox, are placed behind the car, where airflow naturally tapers off. This reduces turbulence and makes the ride quieter – even at highway speeds.

Benefits of rear mounted boxes:

• Significantly less wind noise compared to roof boxes

• Quieter cabin = more comfort on long drives

• Aerodynamic shape reduces drag and improves fuel efficiency

• Mounted lower, keeping the car’s balance intact

Conclusion

Not all boxes are created equal. While roof boxes often add unwanted noise, a rear mounted box offers a quieter, more comfortable, and more efficient drive.

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