Hi,
I have a mazda 323 2002 model i purchased it recently. I noticed a growing humming sound (sound is pretty annoying and big) when the speed enters to 100 km/h upto 110km/h. It seems the sound is from back, but am not sure. Anybody experienced this behavior with your mazda 323?

Thanks for any input

 

The issue was with tyres. I changed all 4 tyres to new Bridgstone tires, since then the sound disappeared.

Thanks