[jlc45]

I bought my car used in '16 with about 52,000 km on it. (32,000 mi.)
Dealer had "refurbished" it with all new brakes (rotors and pads) and all new RFT tires. I don't know when it got the black wheels but they looked pretty new also. Sizes are stock 135i for all. According to VIN lookup this car has M Sport suspension and it seems to sit fairly low. The ride is quite firm on the crappy roads here in Ontario. I recently bought an alternate set of rims and tires off kijiji for a bargain price. They are in excellent shape after I spent a couple hours cleaning them. Car is stone Stock as built.

SETUP 1 as purchased from dealer:
Maybe style 397 black 18" wheels
Fr: 7 1/2" x 18 ET 49
Rr: 8 1/2" x 18 ET52
Tires
Bridgestone Potenza RE 050A RFT
Fr: 215 x 40 x 18
Rr: 245 x 35 x 18

SETUP 2 purchased last week (used but very nice)
Wheels Style 286 from an E90 (pre '13 3 series)
Fr: 7 1/2" x 17 ET 34
Rr: 8 1/2" x 17 ET 39
Tires
Michelin Pilot Sport AS3+ with lots of tread made in 2015
Fr: 225 x 45 x 17
Rr: 255 x 40 x 17

No spacers or other mods
These setup 2 tires have almost exactly same diameter as setup 1 at 636 or 637 mm (25.1")
Initial testing, just cruising around the 'hood indicates no rubbing or interference. Main concern is whether outside edge of tire will rub on fender.
Inside edges of tires are well clear of struts and clear the Brembo brake calipers no problem. I am somewhat surprised and will update if any problems encountered.