I agree you can run staggered wheels on a 535xi just not those. That same vendor sells the same set with 35 & 40 offsets. Both will fit.
I just purchased a set for my 535xi - 19x8.5 et35(245/35R19), 19x9.5 et40(275/30R19).
Ebay Auction Here
With these sizes of wheels you can use offsets from 35-40 and upto 45 on the rear. Just keep the back offsets equal to or greater than the front.
You may want to look at other tire sizes. Since the key to staggered wheels on an xi is to maintain an equal diamter of wheel + tire in the front and back. You want the gears to spin at the same rate or else over time they will wear down. And you're not going to like the price of repair.
My setup has a 1% difference in diameter between front and back. If you go with a 235/35R19 & 265/30R19 the difference is about 0.7%.
With an et35 you may want to use 235/35R19 & 265/30R19 to reduce the risk of rubbing during sharp turns or hard bumps but I'm happy with mine.
2008 BMW 535xi : Black Sapphire Metallic / Grey Leather Interior, Automatic Transmission, Premium, Sport, Cold Weather, Comfort Access, H.U.D., Navigation System, PDC, Rear Sunshade Package, Folding Rear Seats, Rear Side Impact Air Bags, iPod/USB Adapter, Sirius Satellite Radio.
Current Mods/Add-Ons : 3M Clear Bra , Front Illuminated Door Sills, Dinan Stage II, 19" Staggered M3 replicas.
Last edited by ressan; 08-16-2010 at 08:52 AM.