[badmon1992]

Hey all,

Thinking of changing my rims. I Was looking at the m4 rims(style 437M)
I just wanted to know what tire size I should go and I would like to maximize(but keep things normal) so the wheel is closer to the wheel well(so basically it looks beefy)

Bmw 440i xdrive
Rim 437M
Front: 19x9 ET 28
Rear : 19x10 ET 40

I know the default sizes for these rims are
F: 255/35R19
R: 275/35R19
But these sizes I feel were meant for the m4 especially since it is RWD.

But since I have xdrive i was thinking of this size
F:245/35R19
R:275/30R19
If anyone has tried will there be any rubbing?

Let me know if im wrong or this wont work. Thanks for the help.

[danperson1]

Have you considered doing 437m reps? That's what I ended up going with. Then you can get 19x8.5 et35 all around for a nice square setup of 235 or 245s. Or you can go with staggered 8.5 and 9.5.

The xdrive sizes you mentioned should work HOWEVER you will not get the beefy look. The diameter for those sizes (25.5 diameter) are both less than stock diameter(26) which will be further from the wheel well. Maybe do 245/40R19 and 275/35R19 which would put you at 26.7 and fill the wheel gap more. (might get rubbing in rear?)

Or just go with reps and get normal non M4 sizes in there (235-245/40 square or 235/40 &265/35 is pretty ideal)

[mlev]

Go for OEM 437m's if you can get them. Lighter forged wheels with deeper concave that won't bend like the Chinese cast replicas.
For F32 OEM, 255/35 265/35 looks great as aloha referred to.

[danperson1]

Originally Posted by mlev

Go for OEM 437m's if you can get them. Lighter forged wheels with deeper concave that won't bend like the Chinese cast replicas.
For F32 OEM, 255/35 265/35 looks great as aloha referred to.

Some of the ones from the vendors are low pressure cast and better than your typical replica. Like you said not as quality as OEM though but a lot cheaper

Also 255/35 & 265/35 is over 1% diameter difference which most people say you should not do on xDrive.

[alohasurftoad]

OP, please read page1 and 9-13. https://f30.bimmerpost.com/forums/sh...lack+m4+wheels

IMO, 235/40/19, 265/35/19 is best for x drive however limited tire brands and categories in this size combo, especially all season.

245/35/19, 285/35/19 will work but you'll have larger wheel gaps

255/35/19, 265/35/19 will work. since the 265 slightly stretched it reduces its diameter such that the combo is slightly below 1%

since xdrives have large wheel gaps, lowering is recommended. lowering also induces a bit of negative camber and tucks the upper tire shoulder slightly, reducing some poke, especially up front.

[mlev]

Originally Posted by danperson1

Some of the ones from the vendors are low pressure cast and better than your typical replica. Like you said not as quality as OEM though but a lot cheaper

Cast wheels are still a grade below "flow formed" (which are plenty affordable). And they are two grades below forged. Plenty of people have purchased the cast replicas only to get bends from potholes at some point. Cracking seems to be less common but still possible. They end up spending more on the replica repairs and labor than the OEM ones would've cost from the get-go.

Not sure about "a lot cheaper". I understand you're trying to justify your purchase, but many times a used OEM set costs only $200-400 more than your new set of replicas.

[danperson1]

Originally Posted by alohasurftoad

OP, please read page1 and 9-13. https://f30.bimmerpost.com/forums/sh...lack+m4+wheels

255/35/19, 265/35/19 will work. since the 265 slightly stretched it reduces its diameter such that the combo is slightly below 1%

Didn't think about the stretch factor, good point!

[danperson1]

Originally Posted by mlev

Cast wheels are still a grade below "flow formed" (which are plenty affordable). And they are two grades below forged. Plenty of people have purchased the cast replicas only to get bends from potholes at some point. Cracking seems to be less common but still possible. They end up spending more on the replica repairs and labor than the OEM ones would've cost from the get-go.

Not sure about "a lot cheaper". I understand you're trying to justify your purchase, but many times a used OEM set costs only $200-400 more than your new set of replicas.

The replicas are a solid option as long as you don't get the bottom tier gravity cast. Low pressure cast is just as strong as many oem wheels. Not to say you aren't 100 percent right about flow formed and forged being better. If you want a square setup it can be hard to find second hand oems. I watched the classifieds forum for months before finally giving in and going replica. If you can find a good deal like posted above more power to you.

[badmon1992]

Originally Posted by alohasurftoad

OP, please read page1 and 9-13. https://f30.bimmerpost.com/forums/sh...lack+m4+wheels

IMO, 235/40/19, 265/35/19 is best for x drive however limited tire brands and categories in this size combo, especially all season.

245/35/19, 285/35/19 will work but you'll have larger wheel gaps

255/35/19, 265/35/19 will work. since the 265 slightly stretched it reduces its diameter such that the combo is slightly below 1%

since xdrives have large wheel gaps, lowering is recommended. lowering also induces a bit of negative camber and tucks the upper tire shoulder slightly, reducing some poke, especially up front.

The 235/265 combo seems like the right choice. The only thing is idk if it will fit properly... I did an offset calculator but idk if its okay or bad..

[alohasurftoad]

Originally Posted by badmon1992

The 235/265 combo seems like the right choice. The only thing is idk if it will fit properly... I did an offset calculator but idk if its okay or bad..

I'm not sure what your question or concern is about the 235/265 combo fitment is, can you rephrase or elaborate?

https://f30.bimmerpost.com/forums/sh...+wheels&page=3

Reprod and slowf32 have 235/40-265/35 on oem 437