[justswim208]

Total noob here, but found great bargain on a set of 18" stock 436 wheels that were on an M235i xdrive. I don't have the tire specs and the guy doesn't either bc they're off the car at a shop. Wondering if anyone knows how they'll fit if I just throw them on my f30 x drive? TIA

[alohasurftoad]

They'll fit but they'll be way tucked because the wheel offsets are too high. The 2-series tire sizes are also shorter and narrower and will increase wheel gap and cause speedo and odometer error.

You could remedy offset with spacers and change to f3/4 sized tires which reduces the bargain some.

personally I'd rather buy wheels of proper width and offsets with appropriately sized tires.

[justswim208]

Awesome, thanks! Yeah, got them and put them on. Looks a little funny but def looking to change wheels and get spacers. Any recommendations to either?

[alohasurftoad]

Originally Posted by justswim208

Awesome, thanks! Yeah, got them and put them on. Looks a little funny but def looking to change wheels and get spacers. Any recommendations to either?

the wheel specs are 18x7.5 +45, 18x8 +52. for spacers 10mm-12.5mm up front, 15mm rear. these spacer sizes will just put you back to F3/4 offset range. if you want the tires flush you'd need to go thicker.

since the rims are narrow i'd just do 225/45/18 front and 235/45/18 rear.

[justswim208]

So surprisingly, I checked and it's a square setup so 18x7.5 all around. The tires are 225/40/18 all around. Rear look a lot more tucked in that the front. With that said, what are thoughts about spacers and tire specs?

[alohasurftoad]

Originally Posted by justswim208

So surprisingly, I checked and it's a square setup so 18x7.5 all around. The tires are 225/40/18 all around. Rear look a lot more tucked in that the front. With that said, what are thoughts about spacers and tire specs?

https://f30.bimmerpost.com/forums/sh...1634952&page=2

if you are not lowering it. 235/45/18, at 26.3", is a little taller than oem and is the max width you can put on the 7.5", so it will have a slight bulge. however, it will fill the gap, provide more overall grip, and have a better ride and impact protection.

if you prefer a less sidewall then 225/45/18(oem size) will work fine and fits slightly better on 7.5"

for spacers i'd go 12.5mm square, or 10mm/12.5mm, or 12.5mm/15mm max. personally i'd keep the front and rear track width close to oem by using 12.5mm square even though it may look better with wider spacer at the rear but do what you think you'd be happiest with.

[justswim208]

Originally Posted by alohasurftoad

https://f30.bimmerpost.com/forums/sh...1634952&page=2

if you are not lowering it. 235/45/18, at 26.3", is a little taller than oem and is the max width you can put on the 7.5", so it will have a slight bulge. however, it will fill the gap, provide more overall grip, and have a better ride and impact protection.

if you prefer a less sidewall then 225/45/18(oem size) will work fine and fits slightly better on 7.5"

for spacers i'd go 12.5mm square, or 10mm/12.5mm, or 12.5mm/15mm max. personally i'd keep the front and rear track width close to oem by using 12.5mm square even though it may look better with wider spacer at the rear but do what you think you'd be happiest with.

Thank you so much for this! You're awesome!