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      01-02-2020, 11:26 AM   #1
Dekdo
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How should I eliminate my rubbing on my 135i? Running 18x8.5s all around

All 4 wheels are the same, BBS RGR 18x8.5 with 38 offset.

The front tires see rubbing on decent dips or some bumps and harder turns.
Front tire specs: 245/35 R18

Only noticed rubbing in the rear once on a sharp dip in the road.
Rear tire specs: 265/35 ZR18

The previous owner told me that there are no spacers.

Would a 235/35 in the front solve this? And a 255/35 in the back?
Suspension is stock (m sport package) so I donít know maybe itís worth getting stiffer springs? I am more concerned with the front than the back.
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      01-02-2020, 11:43 AM   #2
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245 in front is a tight fit and you have to almost nail it just right. I would think the 38 offset is pretty good, it's certainly not way off, but my guess is that you are just barely too far out. A 235 fits well for most folks and can handle a small range of offsets and still not rub. A little extra camber might do the trick as well. I'd guess you are rubbing on the outside of the tire - can you tell for sure (i.e. look for wear)?

The 38 offset is a bit much for the back, positions the wheels out farther than normal. Spacers wouldn't help just hurt. If you're only rubbing occasionally then yes the narrower tire would probably do it.

Thsi might help: https://support.apexraceparts.com/hc...-Fitment-Guide
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      01-02-2020, 12:15 PM   #3
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Iíll try to check, but my assumption is on the outside of the tire for the fronts. Iíll look to get 235 when it comes time to replace the front tires and 255 in the back.

Looks like I may need to go to 235/40 Or 225/40 in the front.

Last edited by Dekdo; 01-02-2020 at 05:06 PM..
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      01-03-2020, 03:31 AM   #4
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a 245/35 and 235/40 will both probably give you the same problem. Even though the footprint is a bit smaller, the taller sidewall will deflect more under load and still rub. When it fits that close it's just a game you can't win.

Camber is going to be your friend here.

Worst case, bring the wheels to a machine shop and have some cut off the hub so they sit in deeper. No rule against doing that.
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      01-03-2020, 02:10 PM   #5
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Quote:
Originally Posted by iminhell1 View Post
a 245/35 and 235/40 will both probably give you the same problem. Even though the footprint is a bit smaller, the taller sidewall will deflect more under load and still rub. When it fits that close it's just a game you can't win.

Camber is going to be your friend here.

Worst case, bring the wheels to a machine shop and have some cut off the hub so they sit in deeper. No rule against doing that.
Yeah I was looking at the measurements and was afraid that might be the case.

Iím also wondering if I could get away with a 225/35 in the front..?
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      01-03-2020, 04:09 PM   #6
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Quote:
Originally Posted by Dekdo View Post
I’m also wondering if I could get away with a 225/35 in the front..?
That should be no problem at all. You probably don't need to go that far even.

(Unless you meant 225/40)

Check out my link, the "popular setup" is what I have and it works really well. There's even plenty of room in the back w/ that setup and in fact I run 5mm spacers in the back w/ no rubbing just for appearance's sake.

I'm not advocating you get that setup exactly but it'll give you an idea of a working combination, so you can think about your own offsets and tires in relation.

Everything of course is a gamble. Since you aren't rubbing super often it implies that - a cm off tire width (i.e. 245 to 235, w the same sidewall height i.e. 35% in both cases) would be sufficient to eliminate the rubbing for good. But - it could still be there, less often of course but still be there. Hard to say for sure w/out real parts being swapped.

Another thing to keep in mind is that different brands of tire will be different widths and shapes as well, even if they indicate as the same size. 235/35 in brand A and B might be a little different *actual* widths, and can have different shapes on the corners as well - one more round and one more squared off, if that description makes sense. One company's 235/35 could be in fact rub more than another's 245/35.

Last edited by tracer bullet; 01-03-2020 at 04:14 PM..
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      01-03-2020, 04:45 PM   #7
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Quote:
Originally Posted by tracer bullet View Post
That should be no problem at all. You probably don't need to go that far even.

(Unless you meant 225/40)

Check out my link, the "popular setup" is what I have and it works really well. There's even plenty of room in the back w/ that setup and in fact I run 5mm spacers in the back w/ no rubbing just for appearance's sake.

I'm not advocating you get that setup exactly but it'll give you an idea of a working combination, so you can think about your own offsets and tires in relation.

Everything of course is a gamble. Since you aren't rubbing super often it implies that - a cm off tire width (i.e. 245 to 235, w the same sidewall height i.e. 35% in both cases) would be sufficient to eliminate the rubbing for good. But - it could still be there, less often of course but still be there. Hard to say for sure w/out real parts being swapped.

Another thing to keep in mind is that different brands of tire will be different widths and shapes as well, even if they indicate as the same size. 235/35 in brand A and B might be a little different *actual* widths, and can have different shapes on the corners as well - one more round and one more squared off, if that description makes sense. One company's 235/35 could be in fact rub more than another's 245/35.
Yeah that makes sense, definitely hard to say until you actually get the tires on there.

What did you mean about 225/40?
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      01-03-2020, 05:16 PM   #8
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Quote:
Originally Posted by Dekdo View Post
The previous owner told me that there are no spacers.
You may want to pull off the rear wheel and double-check this if you aren't sure. If you're running spacers in the rear right now, simply removing the spacers might be enough to eliminate the rub.

Thanks
-Tom
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      01-03-2020, 05:26 PM   #9
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Quote:
Originally Posted by Dekdo View Post
What did you mean about 225/40?
You asked if you could "get away" with 225/35. Since that's 20mm smaller than what you have now I felt that was an obvious yes, and so I wondered if you had a typo. And was trying to guess if you mean something different. If not, never mind.
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      01-04-2020, 05:03 PM   #10
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
You may want to pull off the rear wheel and double-check this if you aren't sure. If you're running spacers in the rear right now, simply removing the spacers might be enough to eliminate the rub.

Thanks
-Tom
Will take a look next weekend when I put the 17in winter setup on.
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      01-06-2020, 04:41 PM   #11
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225/40/18 all around will solve all your rubbing issues. No need to worry about less grip as long as you buy the real deal tires. advan ad08r or similar
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      01-14-2020, 08:50 PM   #12
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Originally Posted by Kreester View Post
225/40/18 all around will solve all your rubbing issues. No need to worry about less grip as long as you buy the real deal tires. advan ad08r or similar
I mean considering i only get rubbing occasionally in the rear with 265s.. I will step down to 255, and maybe 245 at the lowest.

In the front I dont mind running 225.
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      01-15-2020, 09:08 AM   #13
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Most folks are looking for as much tire in the front as possible for handling balance. You might try to see where you are rubbing on the tire, if there's any evidence of what you're hitting.

Depending on what you're hitting, a little extra camber might solve it - it does for some people. And it helps for handling and even tire wear as well if you drive aggressively or on a track.

Then again it might not, but if that's what it is it might save having to get new tires.
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      01-24-2020, 06:42 PM   #14
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Would 8.5 ET40 both front and rear fit? With 225/40/18 front and 255/35/18 in the rear?
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      01-24-2020, 07:00 PM   #15
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Originally Posted by Pickleriiick View Post
Would 8.5 ET40 both front and rear fit? With 225/40/18 front and 255/35/18 in the rear?
It should fit fine in the front with a 225/40-18 tire. From what we have seen, fitting a 255/35-18 on the rear is going to be more difficult. You will likely need some combination of rolled rear fenders and rear negative camber in order to fit that tire without rubbing.

Thanks
-Tom
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      01-24-2020, 08:50 PM   #16
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
It should fit fine in the front with a 225/40-18 tire. From what we have seen, fitting a 255/35-18 on the rear is going to be more difficult. You will likely need some combination of rolled rear fenders and rear negative camber in order to fit that tire without rubbing.

Thanks
-Tom
Thought it would be possible without rolling the fenders, when you can fit a 9,5 ET45 with 255 wide with no problems... The problem is that I don't know how close the wheel is to the fender, would it be better if i run 245's?

Thanks a lot!
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      01-27-2020, 07:48 PM   #17
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Quote:
Originally Posted by Pickleriiick View Post
Thought it would be possible without rolling the fenders, when you can fit a 9,5 ET45 with 255 wide with no problems... The problem is that I don't know how close the wheel is to the fender, would it be better if i run 245's?

Thanks a lot!
245s would likely fit without any issues. Depending on the tire, you might be able to get the 255s to work in the rear but I suspect you will have to dial in a small amount of camber in order to have a completely rub-free fitment.

Thanks
-Tom
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      01-27-2020, 10:15 PM   #18
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Does more negative camber in the rear not simply push the wheel out and cause more fitment issue?

In the front, more neg camber tucks the wheel in because you're sliding the strut inwards at the top. In the rear, you're pushing the bottom arm outboard. At least that's how it is on older bmws, maybe the e8x/e9x is different?
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      Yesterday, 09:49 AM   #19
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Originally Posted by TboneS54 View Post
In the rear, you're pushing the bottom arm outboard.
Good question, is the adjustment built into that large rear lower control arm?

Even then it depends on how things are connected and where it pivots, etc. There are a lot of links. It may do a combo of both, kick the top in and push the bottom out.
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      Yesterday, 02:12 PM   #20
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I believe it is an eccentric bolt that kicks the lower control arm out slightly which then tucks in the top of the tire a bit. The effect is not as dramatic in the rear as it is in the front where the strut/wheel assembly moves inboard, but it can still help with fitment if the issue is small.

-Tom
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