[Think-U-R-Mario-Andretti?]

Hi Everyone,
I recently got a 2019 M240 Convertible with the 405 wheel & tire package.
Front: 19 x 7.5 405 M Performance wheel with 225/35/19 HP Run-Flats
Rear: 19 x 8.0 " " 245/30/19 "

I want to fit bigger tires/wheels and switch to non run-flat

GOAL:
Front: 245/35/19 Michelin Pilot Sport S4 Non Run-Flats
Rear: 265/30/19 " "

QUESTION:
1. Has anyone here fit this size tires successfully onto this car?
2. Front - what size wheel 19 x 8.0 or 19 x 8.5 with what Offset Et.?
3. Rear - " 19 x 9.0 or 19 x 9.5 " ?
4. Which Brands have the right combination?

DINAN:
They are offering a BBS CR-I Wheel set
Front: 19 x 8.0 Et. 45 but only 235/35/19 Michelin's
Rear: 19 x 9.0 Et. 48 for 265/30/19
"
AC SCHNITZER
they offer wheels, but don't specify the tire size
Front: 19 x 8.5 Et. 43
Rear: 19 x 9.5 Et. 50

Anyone here who knows if they fit and what wheel brand, size and offset is needed?

Thank you
Matthias

[Kokanator135]

Subscribed....also very interested in this.

I have a 2019 M240i vert on order, not a huge rush to get wheels, but when I do, I also want 19" wheels that I can stuff as much rubber on as possible. Want as flush a fitment as possible, some poke is even ok, as long as no rubbing, fender-rolling, camber needed. Oh, and will stay on stock suspension.

Those BBS CI-R look amazing! I saw tirerack having a 19" option, but I can't remeber the other specs right now, other than the fact that they are 19".

Lurking around these forums trying to get my fix in anticipation of actually recieving my car. I hope ur enjoying your convertible, OP, I'd love to hear more about it/see pics
Thanks

[Razzback]

Yes 245/265 is possible. You'll need 1.5-2° negative camber and an 8-8.5" wheel upfront with an offset of about 40. In the rear, a 9-9.5" wheel with an offset of about 50. Fitment will vary depending on wheel & tire manufacturer & diameter. I would check the wheel & tire section of the forum for more info on real world combos that work. I'd start with checking out Apex or VMR wheels & Dinan or Ground Control camber plates. Fender roll is also a good idea to be on the safe side, especially if you run aftermarket springs.

This is, however, not a super common combination. 225/255 is the most common, while 235/265 (dinan's recommended sizes) drop in as well with proper offsets.

[jules_78th]

Curios, is it standard practice for a staggered setup to not have a the same sidewall height? I noticed that OEM for the performance comes at 225/35 front, while rear is 245/30. Why is that?

I'm looking to get a 19' staggered setup myself but will probably go 235 front and 255 back. I think thats more common, but not sure what side wall height would be. I'm thinking at least 35?

[Joe240]

The side wall height, or aspect ratio, is dependent of the tire width, or first number. Having different aspect ratios isn’t a problem for most vehicles. The issue arises when someone utilizes a wheel/tire combo that is significantly taller/smaller than the factory height. It throws off the actual mph they are traveling vs what the gauge will display.

The other issue comes for all wheel drive vehicles because most systems detect one set of wheels rotating faster than the others and determine this to be wheel slippage, ultimately sending power towards the opposite set of wheels to compensate which can cause premature wear on the transfer case. An example of this would be having larger rear combo than the front wheels in an xDrive vehicle. The xDrive system is already rear bias, so now it is trying to send even more power to the front and causes the vehicle to lose the driving dynamics designed by BMW.

[Joe240]

Utilize websites like willtheyfit.com and wheel-size.com to see what the factory rolling diameter is, and then find a combo in a similar size. If xDrive, the factory rolling diameter difference between the stock 18” 225/245 is 1.3% so I’d suggest staying below that number for rolling diameter.

[john16443]

Originally Posted by Joe240

Utilize websites like willtheyfit.com and wheel-size.com to see what the factory rolling diameter is, and then find a combo in a similar size. If xDrive, the factory rolling diameter difference between the stock 18” 225/245 is 1.3% so I’d suggest staying below that number for rolling diameter.

Or use the one available to you in this forum compliments of TireRack. Found in the E90 3 series area.

https://www.e90post.com/forums/forumdisplay.php?f=12