[stylez]

I finally got a set of wheels for my 2014 bmw 428i xdrive coupe. They are 20x9 and 20x10.5 +35 all the way around. I read and test fit the +35 in the rear and it poked out too much for my taste. I got a steal on these wheels and am trying to make it work. I went to my wheel guy and after looking at it, he said he can shave between 5-7 mm off them and it still be safe. So now the front is 20x9 +35 (read this was perfect) and 20x10.5 +40-42 (read this was questionable). I am trying to have as much meat on the tire, both width and height, with no gap and maybe a little tuck, and be as low as possible without a rub. I ordered my H&R sport springs, since super sports aren't made for the xdrive. So I have the wheels and the springs are on the way. Last question is what tires to go with? Im thinking 245/30 up front and am wondering if 285/30 will fit in the rear or what the recommended set up is for no rubbing issues and no gap. Please help! I want to order them tomorrow. Dippydo betlion

[stylez]

MrMikeHenry

Tagging you guys because from all the reading on these forums, you guys have great set ups and seem knowledgeable and willing to help. Thanks

[squidlyboy]

Wondering what 20x10.5 +35 poke looks like... mind if if ask you take a pic of your rears (straight from the rear)? Or did your wheel guy already do the mods?

I've got 9.5 +35 and its flush, but i want to go more aggressive. An extra inch may be too much, as i'll get 13mm extra poke, but i'm curious ...

[stylez]

This is on complete stock 428i xdrive coupe m package

[squidlyboy]

yup, that's about 1/2 inch out lol

dayum... that's some serious poke i don't know how i feel about that yet, but thanks for doing that!

[Dippydo]

If the wheel guy can take off 7mm with the H&R Sport springs, you will be fine with a 275/30. You will not be tucking and there will be a gap, but you should not rub on H&R Sports. I've never had 285/30 so I cannot speak for that size. Here is a pic with an ET42 275/30 and no rub with the H&R coil over setup.

When I talked to Vossen about shaving the hubs when I switched to KW, they told me no more than 3mm, so I went 2.5mm to be safe. I am sure your wheel guy knows, but I would double check with the wheel factory on what they would consider safe. The last thing you want is to shave it 7mm or even 5mm and be driving down the road, hit a hole and the wheel breaks off. I've seen it happen. If you are lucky you will just have major damage to fix and not be killed or kill someone else.

Since you have not mounted the tires while you are talking to the factory, ask if you can swap the rears out for the proper offset. It will cost you around 50 bucks a wheel to shave so even if they said sure with 150-200 bucks on my end I would go for it and swap them. If they do agree to that, then ask for a ET45 because that is really the best offset for this car with a 10.5 wheel if you want to tuck. Even the guys originally making only ET42 are now changing the recommended to 45. I was tucking about 3/4" of tire with the H&R setup but the ride was pretty stiff which was one reason I switched to KW. There is a guy on here that is running 295/25 but his wheel was a 45ET.

[romanonj]

Originally Posted by stylez

This is on complete stock 428i xdrive coupe m package

If the pic after the hub has been shaved?

[betlion]

i had 20x10.5 et42 on the rears with 275/30/20 lowered with hr super sports, no rubbing at all.

[snj49er]

Originally Posted by stylez

Im thinking 245/30 up front and am wondering if 285/30 will fit in the rear or what the recommended set up is for no rubbing issues and no gap.

BMW recommends that the front and rear tire sizes be within 1% on x-drives. In the combination that you're describing, the rear is 3.5% larger than the front.

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

[stylez]

I already tried contacting the manufacturer and they said no, which really sucks. Thats the only reason I resorted to shaving the wheels. The pics are without the wheels shaved. And now I understand the 1% with xdrive. Sucks that I can't be tucked and there will be a gap no matter what unless I get coilovers, which I am not willing to. I guess I wanted to go with 285/30 to fill it in more but think I will just go with 275/30 with 245/35 in the front.

Thanks for the responses guys! Ill post pics when I am done, shouldn't be long

[romanonj]

Originally Posted by stylez

I already tried contacting the manufacturer and they said no, which really sucks. Thats the only reason I resorted to shaving the wheels. The pics are without the wheels shaved. And now I understand the 1% with xdrive. Sucks that I can't be tucked and there will be a gap no matter what unless I get coilovers, which I am not willing to. I guess I wanted to go with 285/30 to fill it in more but think I will just go with 275/30 with 245/35 in the front.

Thanks for the responses guys! Ill post pics when I am done, shouldn't be long

Cool man, please do. I am in the same situation now.

[squidlyboy]

Originally Posted by betlion

i had 20x10.5 et42 on the rears with 275/30/20 lowered with hr super sports, no rubbing at all.

you got a pic of that? curious how much you can lower going that aggressive. bet you can't tuck the tires. that's about a quarter inch of poke on the rims

[perzonal]

Serious lift lol. How did it end up?

[Superlative]

Originally Posted by stylez

I finally got a set of wheels for my 2014 bmw 428i xdrive coupe. They are 20x9 and 20x10.5 +35 all the way around. I read and test fit the +35 in the rear and it poked out too much for my taste. I got a steal on these wheels and am trying to make it work. I went to my wheel guy and after looking at it, he said he can shave between 5-7 mm off them and it still be safe. So now the front is 20x9 +35 (read this was perfect) and 20x10.5 +40-42 (read this was questionable). I am trying to have as much meat on the tire, both width and height, with no gap and maybe a little tuck, and be as low as possible without a rub. I ordered my H&R sport springs, since super sports aren't made for the xdrive. So I have the wheels and the springs are on the way. Last question is what tires to go with? Im thinking 245/30 up front and am wondering if 285/30 will fit in the rear or what the recommended set up is for no rubbing issues and no gap. Please help! I want to order them tomorrow. Dippydo betlion

How can a ET35 poke out so much? xDrive OEM on the rear is ET47. Lots have stuck 15mm spacers for a perfectly flush fit. 47-15 = 32 in my world. And you're still safe by 3mm! What you're probably seeing is ET20. Get out your ruler and measure the wheel.

[Superlative]

double post

[theEZV]

Originally Posted by Superlative

double post

x8.5 +32 is not the same as x10.5 +32, or anywhere close. x10.5 "pokes out", for lack of a better term, an extra 20mm or so. Are you completely ignoring the wheel width?

[Superlative]

Originally Posted by theEZV

x8.5 +32 is not the same as x10.5 +32, or anywhere close. x10.5 "pokes out", for lack of a better term, an extra 20mm or so. Are you completely ignoring the wheel width?

That's exactly what I'm pointing out. Op ignored wheel width and is thinking of sticking 285s on a ET35 wheel. Poke city... and that is the term. ET35 on 255 OEM would be fine.

[wdeerfield]

Superlative i dont think you understand what offset and rim width are.

[Superlative]

Originally Posted by wdeerfield

Superlative i dont think you understand what offset and rim width are.

The OP has a F36 with Xdrive. The general agreement is, with the 19 OEM (19x8 ET36, 19x8.5 ET47), a 10-12mm spacer front and 15-20mm spacer rear gives the best flush fitment.

OP is asking for fitment of 9x20 and 10.5x20 both ET35 with 245/30 front, 285/30 rear. First thing to check: are the tire diameters within the <1% difference for Xdrive? 245/285 is a +3.5% difference. NOT GOOD FOR XDrive.

Let's assume these tires are fitted to the wheels and stuck on his F36. The 245/30R20 ET35 will be fine, since compared to OEM, that tire/wheel/offset combination will be 10mm farther out. The 285/30R20 ET35 will be 27mm further out than OEM. Well beyond the 15-20mm acceptable space compared to OEM. That will poke out.

A better combination would be 235/30R20 ET30 front and 275/35R20 ET40 rear. This gives 0.0% wheel diameter ratio, flush fitment (front is equivalent of adding an 11mm spacer to 19 OEM 225/40 ET36, rear is the equivalent of adding a 17mm spacer to 19 OEM 255/35 ET47), and also filling 0.5" of wheel well space.

Check the numbers yourself:
https://tiresize.com/calculator/
https://tiresize.com/wheel-offset-calculator/

[Superlative]

Originally Posted by wdeerfield

Superlative i dont think you understand what offset and rim width are.

One other thing: knowing the offset and rim width doesn't give you an accurate representation of the full width of the wheel. A rim will be listed as 10" wide, but that's the bead to bead measurement; it doesn't take into account what the actual tire width adds, which is about 0.75-1.0" to the effective rim width. That's why offset calculators ask for tire width. It's up to you to pick the proper tire width for the proper rim to avoid stretching.

Here's a perfect example of how rim width doesn't tell you the full story. It's about the tire!

https://f30.bimmerpost.com/forums/sh...&postcount=906

[F30baggchassr]

Originally Posted by stylez

This is on complete stock 428i xdrive coupe m package

Can you show a pic of them installed with tires and lowered off the jack please? I have the same set up as in offsets and width I trynna see how it will look thanks