Are you guys noticing these vibration problems on both highway and local roads? I only noticed it between 60-65mph after changing tires/rims so I got them to rebalance it and it's still doing it, but only at 70-75mph now, but not everytime (but most of the time) at that speed - it seems to settle in and stop vibrating the longer I drive that session. Extremely weird. Could that even be a balance problem if it acts like that? Shouldn't it be constant and every time?

Some people on other boards are saying possible bad wheel bearing, bad tire, broken/shifting belt.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr