M340i 18" Tire Size Options?

springerdrive · 10-30-2021, 12:21 PM

We hope to take delivery of our 2022 M340ix in December. It's coming with 18” M Double-spoke bi-color orbit grey wheels and all-season run-flats that I want to replace, probably with Pilot Sport All-Season 4.

What is the size of these stock run-flats? 225/40/18? How much wider can I safely go with the replacement Michelins without having problems?

jg4c · 10-30-2021, 03:17 PM

245 max on the width. 😬

marco000 · 10-30-2021, 04:34 PM

Your wheels/tires should be style 790m all season run flat.

The rim size is 18 * 7.5J, tire size is 225/45/R18

for 7.5J..225 is already a reasonable width, though some table would say 235 is the maximum.

jg4c · 10-30-2021, 06:04 PM

Didn’t realize your rim was 7.5. Thought it was 8.
Stick with stock 225 size. Max 235. Not sure it’s worth the bother for for 10 mm.

Justagoodguy · 11-05-2021, 02:58 PM

Hi guys! I'm thinking about 18x8 front and 18x9 rear, custom forged wheels.
On front 235/45, on rear 265/40. But, i can't understand and pick up the right ET fitment fo these wheels specs.
Can someone help me ? What is best ET for this wheel specs ? i' dont need agressive fitment, just to not rub the arches and not bite the rubber.

10-30-2021, 12:21 PM	#1
springerdrive Lieutenant 286 Rep 552 Posts Drives: 2022 M340xi Join Date: Aug 2021 Location: Raleigh, NC iTrader: (0)	M340i 18" Tire Size Options? We hope to take delivery of our 2022 M340ix in December. It's coming with 18” M Double-spoke bi-color orbit grey wheels and all-season run-flats that I want to replace, probably with Pilot Sport All-Season 4. What is the size of these stock run-flats? 225/40/18? How much wider can I safely go with the replacement Michelins without having problems?
	Appreciate 0 Tweet Quote

10-30-2021, 03:17 PM	#2
jg4c Lieutenant 359 Rep 599 Posts Drives: 2022 M340i XDrive Join Date: Feb 2021 Location: NYC iTrader: (0)	245 max on the width. 😬
	Appreciate 1 springerdrive285.50 Quote

10-30-2021, 04:34 PM	#3
marco000 New Member 7 Rep 22 Posts Drives: BMW M340I Join Date: Aug 2021 Location: California, USA iTrader: (0)	Your wheels/tires should be style 790m all season run flat. The rim size is 18 * 7.5J, tire size is 225/45/R18 for 7.5J..225 is already a reasonable width, though some table would say 235 is the maximum.
	Appreciate 1 springerdrive285.50 Quote

10-30-2021, 06:04 PM	#4
jg4c Lieutenant 359 Rep 599 Posts Drives: 2022 M340i XDrive Join Date: Feb 2021 Location: NYC iTrader: (0)	Didn’t realize your rim was 7.5. Thought it was 8. Stick with stock 225 size. Max 235. Not sure it’s worth the bother for for 10 mm.
	Appreciate 1 springerdrive285.50 Quote

11-05-2021, 02:58 PM	#5
Justagoodguy Private 59 Rep 60 Posts Drives: M340i Xdrive Join Date: Oct 2021 Location: Kyiv iTrader: (0)	Hi guys! I'm thinking about 18x8 front and 18x9 rear, custom forged wheels. On front 235/45, on rear 265/40. But, i can't understand and pick up the right ET fitment fo these wheels specs. Can someone help me ? What is best ET for this wheel specs ? i' dont need agressive fitment, just to not rub the arches and not bite the rubber.
	Appreciate 0 Quote