I have an 01 S4 and when I hit 70 on the highway i get a slight vibration and I think that it is coming from the driver side front wheel. Could this mean that my wheel is slightly unbalanced or maybe my alignment might be off a little. After I first noticed it I tried about 5 different roads to make sure it wasnt the road and it happens right at 70mph. I dont notice it in the steering wheel directly thats why im thinking its my wheels. Any input would be great.