Thank you for your answers folks, but remember I have STOCK 19s. The rear hubcentric 'rings' don't fit my wheels like a glove, meaning there's a very small gap since I can easily push the wheel in and out without having to 'shove' it in place. Yes, the wheel is beveled to make it easier to install the wheel, but there's minute play when fully mounted with no lug bolts inserted. In addition I had to sand the rusted 'rings' a little to remove all that crap, but shouldn't make a difference with 400 grit sandpaper. I honestly don't think that the 'rings' are an issue just at 60-65 mph; if there was a wheel 'bouncing' problem it'd increase with speed, correct?
My guess is probably balancing, but who knows. Wonder if BMW would pay to check that. Thanks.
Last edited by elp_jc; 07-24-2009 at 02:29 PM.