Do the stock tires fit a non sport with no modification? the 255 40 19 is the ones I'm worried about!

 

You may get some rubbing with those in front. Many non-M owners w/166s use 245 35 19 in front.

 

You are going to RUB

The farthest you can go is 245/40/19

 

youre gonna rub like and Indian burn...
yea, add to that, those stock tires on M5s look like damn truck tires! way too thick....me no likey. but the 166 wheels are awesome, wrap them in some better (lower profile) rubber....dare i say stretch them a little and they will look awesome!

 

recommended tire sizes would be 245/35/19 front and 275/30/19 rear

 

I mounted them up and no rubbing! I kinds like the extra tire for ride comfort! I'm sure the lower profile would look better