I am puttin sum 18x7.5 wheels - 42 offset & 215/35/18 tires on my xB!

Will I need spacers on the rear even though it's not lowered yet?
What size spacer wil I need if so?

Thanx!

Yes, you will want spacers. Order a set of 10 mm One Ton Garage hub spacers for the rear. 7.5" with a +42 offset is just too close for comfort.

So with a 10mm spacer, would that make it a +32 offset??

you're only adding 1/4" width on either side from a 7" wheel, and i ran a 7" wide 42mm offset 17" wheel.. with no problems.. i dont think spacers are required.. could be wrong..

my wheels are 18x7.5 with +45 offset and im not rubbing at all.. the rears barely touch

my wheels are 18x7.5 with +45 offset and im not rubbing at all.. the rears barely touch im not using spacers either

I ran that exact setup at first, 215/35/18 42 offset and it never rubbed with a 2" drop. I highly suggest getting the OTG shim AND a 5 or 10mm spacer to bring the tires flush with the fender. I'm running a 10mm OTG shim with a 10mm OTG spacer and it's just right for my taste.

I have 18x7.5 +42 wheels with a 2" drop and I have some rubbage in the rear every so often, but the otg spacers will fix that when they come in the mail.