I noticed a lot more passenger seat shaking (plus vibration in driver's) after I got my new rims and 20s on. But this only happens at 60mph++. I went back to the aftermarket shop and had them rebalance the wheels (they placed weights at different places this time) and now the problem exists at 70-80mph only.

Would the dealer be able to do anything AT ALL about this under warranty? I don't want to bring it back to that place a 3rd time as obviously they can't fix it - I don't want them messing with the rims anymore either. Do the dealers look up to see (or know) that these were done aftermarket, etc. and they are not responsible (at least under warranty)...

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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