I bought a used car with worn-out tires. Between speeds of 14-45mph the car vibrates and produces low frequency growling/droning noise. When above 45 mph, vibrations go away but drone pitch increases (volume remains same) though its not too bad.
Few details: Car : RWD BMW z4 - No vibrations in steering, just vibrations in seat.
Alignment was done before purchase by the seller. (I've the receipt)
Rear RFT tires are totally gone ~5% tread life left. Front non-RFT have 70% tread. I'm getting them replaced soon.
No difference between accelerating, braking,cruising, or coasting. sound and vibration remain constant in the speed range.
I scanned obd port, no error/fault codes.
brakes squeal when brake paddle is pressed lightly. Higher pressure and its gone.
Is it worn out rear tires or something more serious?