If the rim is not visibly bent it should not cause a vibration.
I had the same problem, vibration starting at about 40mph, increased under braking. I had all four wheels rebalanced, and voila smooooooth ride.
I just thought of something else... if the balancing does not help it might be the drive shaft guibo (would have to be replaced), or the drive shaft needs to be rebalanced (very raraly needed but it happens). An indication for that would be a vibration between 40 and 60mph.
If none of the above check rotors and control arm bushings.
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I have the same problem between 45 and 65 mph, but I think mine is caused by bent rims. I can see my rims are noticably bent when I jack the car up and spin the wheel. I'm going to try swapping mine with a some stock wheels (if I can ever find some) and see if that fixes the problem. If your rims don't look bent on the outside, they might be on the inside. Make sure you check this out too.
I've heard different stories regarding this issue. One of them is the bent rim issue. Another is imbalanced tires, but the wierdest one i've heard is from a Mercedes Benz dealership where a tech accidentally used the water hose instead of the air hose!! So the tire was filled with a little water and it caused vibration at high speeds.
Ok i have the same problem with my 1998 328i but mine is not a light shaking it is vileont. It shakes really bad especially when I brake and I don't have a clue how to fix it or what it is. Help me PLEASE!!
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