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[woody888]

Hello, guys.

I know this is kind a common issue.

I'm wondering why my setting will make the front tires rub tires while turning.

I have APEX arc8/10J with 275/35/18 which should be appropriate setting to E92.

anyone can tell how I can fix it with cheap method? there is a small holes on the Fender Liner.

[//steve\\]

Common issue, I'm not sure it can be avoided aside from sticking to stock wheels/tires without any kind of spacers. Mine are totally worn through in that area.

[woody888]

Originally Posted by //steve\\

Common issue, I'm not sure it can be avoided aside from sticking to stock wheels/tires without any kind of spacers. Mine are totally worn through in that area.

What is your tire and wheel setting?

[//steve\\]

I've run 10.5+15 with 265/35/18, 10+15 and 10+13 with 265/38/18 and currently on 10+15 with 275/35/18.

[woody888]

Originally Posted by //steve\\

I've run 10.5+15 with 265/35/18, 10+15 and 10+13 with 265/38/18 and currently on 10+15 with 275/35/18.

Damn~~ your offset are really crazy .

How about your alignment data?

[//steve\\]

-2.5 before, -3 now up front.

[woody888]

Originally Posted by //steve\\

-2.5 before, -3 now up front.

Camber -3 . How about caster? Is your caster adjustable?

[//steve\\]

Originally Posted by woody888

Camber -3 . How about caster? Is your caster adjustable?

Don't recall exactly but lots of it for sure. Car has all SPL arms. somewhere around 8-9 degrees. That said, I am getting ready to pull some of those parts.

[DrFerry]

Originally Posted by woody888

Hello, guys. I know this is kind a common issue. I'm wondering why my setting will make the front tires rub tires while turning. I have APEX arc8/10J with 275/35/18 which should be appropriate setting to E92. anyone can tell how I can fix it with cheap method? there is a small holes on the Fender Liner.

You didn't say what offset your wheels have. Assuming the offset is ~23-25mm, a few cheap fix ideas come to mind:
1: Use a 10mm spacer.
2: Use a lower cold inflation pressure and check if the rubbing is improved, say ~30psi cold
3: Use less negative camber
4: Use less caster
5: All of the above
6: Remove liner and try to refit and/or reposition
7: Measure hot pressures are not way above 34psi to mitigate tire profile shoulder growth.
8: Check ride height is not unusually low (versus original ride height) due to sagging springs and shocks, or worn out lowering springs.
9: Reduce weight of the car and passengers.

That's about all I can think of for now. Hope this helps.

[woody888]

Originally Posted by //steve\\

Don't recall exactly but lots of it for sure. Car has all SPL arms. somewhere around 8-9 degrees. That said, I am getting ready to pull some of those parts.

I think yours is similar to mine. I have SPL arm as well, the silmilar alignment data , still rub...

[woody888]

Originally Posted by DrFerry

You didn't say what offset your wheels have. Assuming the offset is ~23-25mm, a few cheap fix ideas come to mind:
1: Use a 10mm spacer.
2: Use a lower cold inflation pressure and check if the rubbing is improved, say ~30psi cold
3: Use less negative camber
4: Use less caster
5: All of the above
6: Remove liner and try to refit and/or reposition
7: Measure hot pressures are not way above 34psi to mitigate tire profile shoulder growth.
8: Check ride height is not unusually low (versus original ride height) due to sagging springs and shocks, or worn out lowering springs.
9: Reduce weight of the car and passengers.

That's about all I can think of for now. Hope this helps.

wow, thanks man. These are really helpful info to know.
My arc8 10J is et25 , I think this is the common wheel setting, that is why I have no idea why this wheel makes tire rubbing.

I'm so curious one thing that you mentioned, you mentioned about the 10mm spacer on the wheel that means the offset will be et15 .
Just curious the eET15 would not rub?

If the 10mm spacer will solve the issue that will be great. Just don't understand why it is lower Offest

My alignment data: -2 camber , -8 caster , o toe

[DrFerry]

Originally Posted by woody888

Wow, thanks man. These are really helpful info to know. My arc8 10J is et25 , I think this is the common wheel setting, that is why I have no idea why this wheel makes tire rubbing. I'm so curious one thing that you mentioned, you mentioned about the 10mm spacer on the wheel that means the offset will be et15. Just curious the eET15 would not rub? If the 10mm spacer will solve the issue that will be great. Just don't understand why it is lower Offest. My alignment data: -2 camber , -8 caster , o toe

-2 degrees of camber is aggressive for the street and will accelerate inner tire shoulder wear. -0.5 to -1.0 is plenty of negative camber for the street environment and daily driving IMO. I recommend reducing camber and caster if possible in this situation as well as the other mitigation items already suggested and listed earlier.

A 10mm spacer simply serves to move the wheel and tire 10mm further out and perhaps allow for slightly more space (gap) between the tread shoulder and fender liner when turning.

I certainly can not say for sure that ET15 would not rub, but since you already have rubbing, then it's worth trying IMO. BUT try reducing the negative camber first, because due to the way caster and suspension geometry work; when a tire with caster is turned it gains even more negative camber. Additionally, is your car lowered?
.
https://grassrootsmotorsports.com/ar...ndling-basics/
.

[woody888]

Originally Posted by DrFerry

-2 degrees of camber is aggressive for the street and will accelerate inner tire shoulder wear. -0.5 to -1.0 is plenty of negative camber for the street environment and daily driving IMO. I recommend reducing camber and caster if possible in this situation as well as the other mitigation items already suggested and listed earlier.

A 10mm spacer simply serves to move the wheel and tire 10mm further out and perhaps allow for space (gap) between the tread shoulder and fender liner when turning.

I certainly can not say for sure that ET15 would not rub, but since you already have rubbing, then it's worth trying IMO. BUT try reducing the negative camber first, because due to the way caster and suspension geometry work; when a tire with caster is turned it gains even more negative camber.
.
https://grassrootsmotorsports.com/ar...ndling-basics/
.

sounds really professional info. I will try 12mm or 10mm which I have now.

this m3 is not for daily drive. so the aligment would be fine for me. just want to avoid rubbing.

however, that is really interesting with spacer. I was thinking to install without any spacer. I thought it was spacer that makes rubbing

[drwankel]

You are running into the exact same issue I had.

The issue is either one or both of two things. The tire size is too wide/tall or you are getting screwed by the wide shoulders of the PS4S tires.

The answer is to move to another tire size or brand.

Just because someone says X tire size works, is not the full story. You have to consider what brand/model tire they say works when considering rub/no rub.

As an example, I had the same rubbing on 275/30/19s on PS4S tires. Moving to a 265/30/19 PS4S tire stopped it. (less wide, slightly less tall)

[omgzirra_exe]

michelins have broad side wall shoulders so they are prone to rubbing. at the common sizing. so you either got a size smaller or get a different tire for the same spec. or just let it rub till it clears

[DrFerry]

Originally Posted by woody888

Sounds really professional info. I will try 12mm or 10mm which I have now. This m3 is not for daily drive. So the alignment would be fine for me. Just want to avoid rubbing. However, that is really interesting with spacer. I was thinking to install without any spacer. I thought it was spacer that makes rubbing

Worth a read:
Rub No-Rub Thread
https://www.m3post.com/forums/showthread.php?t=522139

[woody888]

Originally Posted by drwankel

You are running into the exact same issue I had.

The issue is either one or both of two things. The tire size is too wide/tall or you are getting screwed by the wide shoulders of the PS4S tires.

The answer is to move to another tire size or brand.

Just because someone says X tire size works, is not the full story. You have to consider what brand/model tire they say works when considering rub/no rub.

As an example, I had the same rubbing on 275/30/19s on PS4S tires. Moving to a 265/30/19 PS4S tire stopped it. (less wide, slightly less tall)

move to another size will not be a choice now. I think it is PS4S to wide.

Originally Posted by omgzirra_exe

michelins have broad side wall shoulders so they are prone to rubbing. at the common sizing. so you either got a size smaller or get a different tire for the same spec. or just let it rub till it clears

hmm... have no idea how to avoid rubbing.

Originally Posted by DrFerry

Worth a read:
Rub No-Rub Thread
https://www.m3post.com/forums/showthread.php?t=522139

I've tried 12mm spacer last night, still rub... probably the PS4S is too fat on this size. just so curious if this common tire size rubbing on e9X M3 is very usual? i'v seen the link you post that there are many owners who have the exact same tire and wheel size have same issue as mine. just want to avoid rubbing. the last i can think to do is heating the fender liner to shaped it.

[DrFerry]

There's some great information on APEX Race Parts E9x M3 Wheel Fitment Guide. Expert@ApexRaceParts , ApexRaceParts , Eddy@ApexRaceParts. The blog fitment guide mentions how 275/35R18 on 18X10 with ET25 may rub slightly: "The front tires may lightly scrub the inner fender liners at full lock or at particular steering angles, and most of the time things will "self clear" over time (a little divot will form in the plastic liner). This is considered par for the course with wider wheels and tires, and enthusiasts shouldn't worry as no major damage will come from this."
See Link:
https://support.apexraceparts.com/hc...-Fitment-Guide

[alpine2530]

I’m running into the same problem. I’ve got a Nitrons coilover installed and recently fitted 10.5x18 et22 with 275/35 tires. They rub in the front specifically back of the front tire. I’m wondering apart from torn fender liners, will this cause any issues if I keep running this setup for track use?

Cheers.