I think i'm done researching and am ready to pull the trigger...

The things I try to get answers to before buying a wheel/tire are:

-will it clear the calipers
-is it the >correct< offset
-will I need to get hubcentric rings
-will I need new lugs/studs
-Is the tire diameter as close to oem as possible *
-Are the tires directional

Now with the X5 -- a few more questions popped up
-Can I get BMW center caps - yes
-How/where what do i get TPMS - think I have that covered
-Do I have to run staggered... answer is no --
-Will I be able to run a * 295/40/20 on a 20x9 all the way around and not get the wheel arch extensions? That I don't know about.

Anyway -- I think these are the ones for me: EXE Konkourse

EXE KonKourse - 20 inch staggered wheels for BMW 5 Series



Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/55-18 5.5in 14.5in 29.0in 91.2in 694 0.0%
295/40-20 4.6in 14.6in 29.3in 92.0in 689 0.9%