Those Giovanna's look pretty tight. I think they would be more at home on my 300 than my x5 but to each his/her own. I don't think the big rims lessen anything as its all about personal taste. However I do agree with TiAgX5. The worst looking thing you can do is not upgrade your brakes. Not only do I not want to be in front of you with that much more rolling weight, but it looks awful when your brakes are size of your rims hub.