i dont know what the nature of this problem is, or if its even a problem. but at about 60km/h and then again at 80km/h and then at various speeds above 100km/h, a booming roaring noise develops. it sounds just like being tailgated by a cheaply modified WRX, and used to cause me to look check my mirrors for said assailants. but it happens on any sealed road from concrete to floated smooth tar to nasty raspy asphalt.
it is very much speed dependant - braking, accelerating, coasting, cornering loads, high and low rpms, up and downhills dont make a difference. i also havent noticed it fluctuating with changing winds [ie a long curve turning into the wind, or choppy winds].
there isnt excess play in the front or rear wheel bearings and the rear wheels spin easily so the bearings arent done up to tight i dont think. i have checked pressures in and swapped the front and rear tyres too, which had exactly zero effect as well.
so im pretty stumped. i took the carpet out of my car so its road-noisier than usual. but i cant remember when i noticed the noise. im pretty sure it wasnt there when i first got the car.
late-breaking idea: the car came with a set of quite new, though not particular expensive tyres. the rears [from the front] are getting a bit bald. could this moaning be a consequence of the tread getting low and resonating? i drive on wet roads often and its never hairy so they arent THAT worn... thoughts?
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