Advice on rim size and width for 06 Z4 3.0 roadster?

[bmwz4roadster84]

I have an 2006 Z4 roadster and i really dont want to lower the car. Maninly because of warranty issues; is this really an issue to dealers? Well if i can't lower the car what would be good wheel size and width for my car? Thanks in advance.

[romanymagic]

It may be worth having a sniff on www.z4um.com - this is something that has crept up on that site previously. Personally I find it comes down to the individual dealers. One dealer I go to on occasion got upset because I had changed from the Bridgestone runflats to Goodyear F1's, whereas someone I know who also has a Z4 had a dealer happily change this tyres to non runflats!!

[bmwz4roadster84]

Thanks for the advice. I will check out the forum.