bmw tech says staggered wheel is okay on xi and has been running it on his.
he runs 18 oem zhp rims on his 2004 330xi.
he has 225/40/18 tires on the front 18.8 and 255/35/18 on his rear 18.8.5 rims.
he has run this setup for over 20,000 miles and his car is dropped with blistien shocks/h&r springs.
he told me the difference between the front and rear is .1 which will harm nothing on the driveshaft.
he also gave me his link to check out on a audi forum.
im planning to buy a 02 325xi from the dealership he works at for dd and keep my 03 zhp for summer.
when i happen to noticed the 330xi with the zhp rims and asked whos car it was. the salesman got the tech and he explained to me it was okay.
just figured i share with you guys since this has been debated a few times.