Thule Roof Bars Noise

They are noisy and when it rains they whistle especially when bike carriers are attached.
Thule roof bars noise. This breaks up the vorticies that create the whistling noise in the first place and is easier than repositioning your rack. The new aero foil cross bars provides a significant improvement in roof rack noise. You can also wrap some 1 4 to 3 8 rope in a spiral around both bars. The thule bars are cheaper and with money being tight and all.
The thule aeroblade and rhino rack vortex bars both feature noise reducing strips that makes them almost silent in many applications. The same thing is happening on your roof rack.
Source : pinterest.com