So my idea is that a set of bmw style 37s would look great on my 2011 R60. The specs of the style 37s are:

Rear: 18x9.5 25mm offset

Front: 18x8 13mm offset

Bore size: 72.56mm. (R60 is 72.6, not sure if the site I used rounded or not)

Bolt pattern is the same for both.

Would I have to do much modification or have large fitment issues with the Style 37s? Currently it’s lowered about an inch from stock as well.
Thanks.

 

2011 R60 Countryman has the following OEM 18" wheels

18x7.5" et52 front and rear with 225/45-18 tires 5x120 bolt pattern

Compared to OEM wheels

Front wheel will be 32.7mm further from inner suspension and poke out 45.4mm more which is too much without a fender flaring or wide fender kit. Usually up to about 15mm is workable for flush fitment.
Rear wheel will be 1.6mm further from inner suspension and poke out 52.4 mm more which is about 2" poke, again no reason to use wide heavy rear wheel and tire on any FWD MINI but on AWD is OK.

225/45-18 fit wheels 7-8.5" wide, tire diameter 25.9"
So on a front 18x8 wheel you can use 225/45-18 and that works and fits fine
On the rear 18x 9.5" wheel you can use either-
255/40-18 fits 8.5-10" wide rims, tire diam 26" or
275/35-18 fits 9-11" wide rims, perfect for 9.5" wide rim, tire diam 25.6"

Alternatively you can use
235/45-18 front, fits 8" wide rim perfectly, tire diam 26.3"
265/40-18 rear, fits 9.5" wide rim perfectly, tire diam 26.3"
Example tire Michelin Pilot Sport 4S

With a lowered suspension you would need tire diameter slightly less than OEM for more clearance from wheel arches. Front wheel width is OK except for poke, rear wheel can be extra wide, just keep tire diameter within limits as wheel arch will be just above middle of tire treads.

Look for a wide fender kit if you want to not have rock chips and mud fly up.