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Sort of have a similar issue in my 528xi. Noticeable vibrations that increase in frequency as the car speeds up. I'm getting new wheels and tyres soon, though, which I imagine will fix a lot of it. Some other things to check, though:
- Control arms
- Suspension bushings
- Axle
- Brake caliper
If your control arm(s) are bad, you're going to have a lot of problems. If your suspension bushings are bad, you'll get vibrations and you'll hear some pretty loud clunks and feel some instability when you go over bumps. If your axle is bent, you'll find the car feels sort of wobbly at low speeds, with a consistent vibration at higher speeds. If you've got a stuck brake caliper or brake drag anywhere, your braking is going to feel uneven and perhaps even "sticky". You'll also get vibrations and uneven brake wear.
Definitely the first place to check is going to be your wheels to make sure they're not damaged, bent, or sized wrong. I'd probably check the brake caliper(s) in the process. Then I'd go to control arm, then bushings, then axle. There's a number of other issues that cause cause that feeling, including your power steering/steering rack, your transmission, and your differentials, but it's usually something in the wheel and/or suspension, so I would look there. Good luck!
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