Just my 2cents - I have been running 23 in front and 33 in the rear Porsche spacers (yes Porsche sells spacers with studs) with 11" techart wheels did not have a rubbing problem until I intalled the ROW suspension which lowered the car about 1 1/2 " but it handles like it was on tracks, I expect to evetuallly have to replace the rear wheel bearings but other than that everything is OK I installed them over a year ago and just recently flared my fender to accomdate the wider wheels-attache before and after pics