[oztiks]

After several hours of reading, I still haven't figured out, what would work best. I plan on using a square set up and would like it to look flush. Do I go with 245/40/18 front,rear or 235/45/18 front and rear or 235/40/18 ?? Which would give me the better look and would be considered BMW approved. The tires will not go on the stock wheels...I intend on buying new ones. Help!!!

[utenigma]

Originally Posted by oztiks

After several hours of reading, I still haven't figured out, what would work best. I plan on using a square set up and would like it to look flush. Do I go with 245/40/18 front,rear or 235/45/18 front and rear or 235/40/18 ?? Which would give me the better look and would be considered BMW approved. The tires will not go on the stock wheels...I intend on buying new ones. Help!!!

So this is what I ended up doing

http://www.f30post.com/forums/showthread.php?t=831520

Pics of the fit before and after from a bunch of angles

Bridgestone 245/40R18 on all four corners on stock 397 18x8" rims

They fit no problem and absolutely transform the car's handling