I just love how the advertisement above this thread says "got vibration in your new wheels?"
Whenever you get a problem like this, work your way up from the cheapest to most expensive fix... so check tire pressure... check your rims and tires for dents and damage that may cause them to wobble. This might sound like a stupid question, but do you have the same brand of wheels on the car, and have they been changed at the same time. Go from there and best of luck
1992 325i / Briliant rot - SOLD @ 301,000km
1998 318is / Arktic silber - SOLD @ 207,000km
2007 335i / Jet Black - CURRENT @ 28,000 km