So there are two fitments available for our cars... flat face 17x9+49 and concave face 17x9.5+45. I can't seem to find a clear answer on which one has easier bbk fitment. I don't have one yet but I will in the future and want to plan ahead. Logically you would think the concave face would be easier to fit them but it doesn't seem to be the case. Anyone know the answer and why that is?

 

Check out the second post on this For Sale thread. The owner of the white S required a 3mm to clear the Stoptech BBK on his 17x9.5 +45. Hope this helps.

https://www.s2ki.com/forums/wheels-t...-49-a-1190813/

 

17x9 +49 has easier BBK fitment but is comparatively narrow when looking at the other available options.

I'd recommend the SA72R in 17x9.5 +47 or 17x10+55 for better width and clearance over the TC105X in 17x9.5 +45, which needs a spacer to clear.

 

Most concave wheels spokes usually come too close to the brake calipers from upper middle towards center. If brake calipers were right at the outer spokes then sure it can clear.