[Skyline_exee]

I have a f30 330i, I have the 18s staggered setup. I have 225/45R18 in the front and 255/40R18 in the back I was thinking like 245/40R18 in the front and 265/40R18 in the back is that something that would work? I have stock suspension and stock rims

[alohasurftoad]

Originally Posted by Skyline_exee

I have a f30 330i, I have the 18s staggered setup. I have 225/45R18 in the front and 255/40R18 in the back I was thinking like 245/40R18 in the front and 265/40R18 in the back is that something that would work? I have stock suspension and stock rims

per tire manufacturer specs, 265 is too wide for the 8.5" rear. it wll be pinched with sidewall bulge. some have force fit it anyway, but it becomes more of a detriment to handling since you lose sidewall support by doing so. i suppose you might gain dig performance and arguably appearance as it will fill the wheel well more. however, i'm not a fan of over-pinched tires with bulging sidewalls and prefer following tire manufacturers rim width range for a given tire size.

i'd leave the rear as is and just increase the front to 245/40/18 which is the max low pro tire width for an 8" rim width.

[speedbirdblack]

Originally Posted by Skyline_exee

I have a f30 330i, I have the 18s staggered setup. I have 225/45R18 in the front and 255/40R18 in the back I was thinking like 245/40R18 in the front and 265/40R18 in the back is that something that would work? I have stock suspension and stock rims

Following!
I also looking for same setup, perhaps 235/245 45 18F, 265/275 40R on M400 wheels.
I quite like the design of the wheels and want to stick with OEM plus concept.

Here is my post;

https://www.bimmerpost.com/forums/sh...php?p=31061732

[alohasurftoad]

Originally Posted by speedbirdblack

I also looking for same setup, perhaps 235/245 45 18F, 265/275 40R on M400 wheels. I quite like the design of the wheels and want to stick with OEM plus concept. Here is my post;
https://www.bimmerpost.com/forums/sh...php?p=31061732

275/40/18(26.6") definitely wont fit on the rear. 265/40/18(26.3") will bulge with less sidewall support. 245/45/18(26.7") sidewalls will be very thick. if you don't care, post pics after their installed for verification.

imo, 245/40/18+255/40/18 or 225/45/18+255/40/18(OEM) are the best size combos for factory staggered rims 18x8+18x8.5

[speedbirdblack]

Originally Posted by alohasurftoad

275/40/18(26.6") definitely wont fit on the rear. 265/40/18(26.3") will bulge with less sidewall support. 245/45/18(26.7") sidewalls will be very thick. if you don't care, post pics after their installed for verification.

imo, 245/40/18+255/40/18 or 225/45/18+255/40/18(OEM) are the best size combos for factory staggered rims 18x8+18x8.5

I get your point.
Eventhough they fit, the tyre profile will be on higher side.

245/45/18F might catch the fender liners on full lock.
235/45/18, 245/40/18 or leave it OEM.
225s looks bit stretched, do not wish to increase the ride hight with 235s. 245/40/18 will consider.

I might want to find a brand which offer wider fitment. I'm unsure.
Currently 50% of tread remaining on them.

Rear on the other hand, 265/40/18 should be alright and im already decided. Then again 4mm increase in ride hight but I can live with that on the rear, unless someone can confirm better fitment with wider tyre with a lower profile.
They need replacing soon.

Currently I'm on EIBACH PRO kit with OE rated Potanza S001 and its practically and aesthetically perfect. Handling and breaking performance are also very good. Nothing much to complain about the ride quality too. Its just that rear needs beefier tyre.
I'm open for ideas and suggestions
Appreciate your inputs.
Here is the current stance. I will update after the fitment.
Cheers!

[alohasurftoad]

275/40(or35)/18 is too wide for an 8.5" rim
265/40/18 is still too wide for 8.5". If force pinched, lateral performance will be not optimal due to less sidewall support from bulge.

If you want wider tires get wider rims such as 513M 18x9 ET29+18×10 ET40 with...
245/40/18+275/35/18 or
235/45/18+265/40/18 or
255/40/18+285/35/18

if you're just seeking to have the tires appear more flush, consider spacers
.

[speedbirdblack]

Originally Posted by alohasurftoad

275/40(or35)/18 is too wide for an 8.5" rim
265/40/18 is still too wide for 8.5". If force pinched, lateral performance will be not optimal due to less sidewall support from bulge.

If you want wider tires get wider rims such as 513M 18x9 ET29+18×10 ET40 with...
245/40/18+275/35/18 or
235/45/18+265/40/18 or
255/40/18+285/35/18

if you're just seeking to have the tires appear more flush, consider spacers
.

Thanks for your valuable Inputs.
I will also consider M437s of M2 in the future with coilovers.

[Skyline_exee]

Originally Posted by alohasurftoad

275/40(or35)/18 is too wide for an 8.5" rim
265/40/18 is still too wide for 8.5". If force pinched, lateral performance will be not optimal due to less sidewall support from bulge.

If you want wider tires get wider rims such as 513M 18x9 ET29+18×10 ET40 with...
245/40/18+275/35/18 or
235/45/18+265/40/18 or
255/40/18+285/35/18

if you're just seeking to have the tires appear more flush, consider spacers
.

So I wanna get new rims would this be a problem ? 18x9.5+35, 5x114.3. Would those fit?

[alohasurftoad]

Originally Posted by Skyline_exee

So I wanna get new rims would this be a problem ? 18x9.5+35, 5x114.3. Would those fit?

Our bolt pattern is 5x120, so it won't fit