Road Hum
I have a hum (that seems to be coming from the left rear) -- it starts around 45 MPH and quits at around 65 MPH -- I took it to a Belle Tire store to see what they could tell me -- the sales person checked my tires and pointed out that the two front tires match but the back ones are each different. Now the sizes etc. are all the same but the manufacturers and the treads are different. He tells me this is not good for an all wheel drive car and that it's probably the cause of my HUM -- I'd just bought the car the prior week and all of the tires are in good shape -- I'd just missed the fact that I have 3 different tire treads patterns -- I'll go shopping for some new tires but my question is: How important is it for all of the tread to be the same for an all wheel drive car?
Thank you for any help / information.
Dan