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2Addicts | BMW 2-Series forum Technical Topics Wheels and Tires -- Sponsored by The Tire Rack Anybody else running a square 18x8.5 ET39 setup?

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      01-13-2020, 08:20 AM   #1
khj24
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Anybody else running a square 18x8.5 ET39 setup?

My tires are getting due for a replacement(225/245), I am pretty sure 255's will fit in the back no problem, and in doing some research that seems to be a recommended change and only affects the speedo by 1%, any experiences with this setup or similar? THANKS!
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      01-13-2020, 12:37 PM   #2
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Quote:
Originally Posted by khj24 View Post
My tires are getting due for a replacement(225/245), I am pretty sure 255's will fit in the back no problem, and in doing some research that seems to be a recommended change and only affects the speedo by 1%, any experiences with this setup or similar? THANKS!
That will definitely fit with 225/245. 255 is big for an 8.5 and may be close to the fender then you would like as 39 is a bit more aggressive than a typical rear offset.
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      01-13-2020, 12:55 PM   #3
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Quote:
Originally Posted by K8_M235i View Post
That will definitely fit with 225/245. 255 is big for an 8.5 and may be close to the fender then you would like as 39 is a bit more aggressive than a typical rear offset.
Ill have to take a look at the fender, I assume you are referring to the added heigh with the 255's? As it stands the 245s poke just the smallest amount, but its basically flush
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      01-13-2020, 03:51 PM   #4
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Quote:
Originally Posted by K8_M235i View Post
That will definitely fit with 225/245. 255 is big for an 8.5 and may be close to the fender then you would like as 39 is a bit more aggressive than a typical rear offset.
Ill have to take a look at the fender, I assume you are referring to the added heigh with the 255's? As it stands the 245s poke just the smallest amount, but its basically flush
The 255s will mount more "balloon" like and be wider than the the lip of the wheel. It would be a wider and fractionally taller.
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      01-13-2020, 06:04 PM   #5
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Quote:
Originally Posted by K8_M235i View Post
The 255s will mount more "balloon" like and be wider than the the lip of the wheel. It would be a wider and fractionally taller.
Considering it already pokes some I think im more worried about the height, but the increase is negligible so I would be surprised if the larger size was an issue
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      01-20-2020, 07:27 PM   #6
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I am running Michelin A/S 3+ in 235/40 front & 255/35 rear on 18x8.5 ET38 F&R. No issues.
Pictures here:
https://www.2addicts.com/forums/show...&postcount=257
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      01-20-2020, 09:40 PM   #7
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Quote:
Originally Posted by PeterWT View Post
I am running Michelin A/S 3+ in 235/40 front & 255/35 rear on 18x8.5 ET38 F&R. No issues.
Pictures here:
https://www.2addicts.com/forums/show...;postcount=257
Sweet! You have the exact same wheel setup as me too, thanks! I'll probably go up a size with the PS4S then
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      01-23-2020, 08:09 PM   #8
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Quote:
Originally Posted by PeterWT View Post
I am running Michelin A/S 3+ in 235/40 front & 255/35 rear on 18x8.5 ET38 F&R. No issues.
Pictures here:
https://www.2addicts.com/forums/show...&postcount=257
Using that config do you notice the car understeers more or seems neutral?
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      01-24-2020, 05:34 PM   #9
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Originally Posted by jgalaxy View Post
Using that config do you notice the car understeers more or seems neutral?
It feels more neutral. Turn in feels sharper.
That may be due to the wider track up front and stiffer sidewalls (higher load rating) on the A/S 3+ vs. the OE PS2
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      06-16-2020, 08:28 AM   #10
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Quote:
Originally Posted by PeterWT View Post
I am running Michelin A/S 3+ in 235/40 front & 255/35 rear on 18x8.5 ET38 F&R. No issues.
Pictures here:
https://www.2addicts.com/forums/show...&postcount=257
did you ever the test fitted the rear 255/35 rear tire in the front for shits and giggles ?
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      06-16-2020, 10:14 AM   #11
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255/35 will fit fine if you have -2 all around.

I have 245/35 and there is a TON of space.
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      06-16-2020, 11:18 AM   #12
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Quote:
Originally Posted by SkyeC View Post
255/35 will fit fine if you have -2 all around.

I have 245/35 and there is a TON of space.
I’ve looked at pictures of the 245/35 and the 255/35, and it seems like the biggest difference between the two is in the height rather than the width.

Last edited by Devil doc; 06-16-2020 at 11:28 AM..
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      06-18-2020, 09:39 AM   #13
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Quote:
Originally Posted by Devil doc View Post
did you ever the test fitted the rear 255/35 rear tire in the front for shits and giggles ?
No, I never did.
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      08-16-2020, 09:02 PM   #14
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Old thread back from the dead, but man the clearance is pretty tight between the strut and tire in my stock suspension set up. It's really just the rim guard that's close since the tire stretches away from the strut on my 8.5 in wheel, but it makes me conflicted. I worry that the 235 MP4S will rub as they are some of the widest tires out there compared to listed width.

On another note- it's so frustrating that I drive straight roads 99.9% of the time yet I'm well into the wear bars on the outer shoulders of the front tires with the middle being at 5/32. Does anybody have experience with the 225 MP4S on an f22 and if the shoulder wear is much improved?
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      08-17-2020, 10:18 AM   #15
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I think ill just take the leap after reading through 15 pages of threads I have seen a few people have no issues with specifically the MP4S on similar setups to me with stock suspension. I will mess around this week and put my stock 245's on the front and see how that fits, because a pure square set up would be sweet to have.
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      09-11-2020, 04:07 PM   #16
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Quote:
Originally Posted by khj24 View Post
I think ill just take the leap after reading through 15 pages of threads I have seen a few people have no issues with specifically the MP4S on similar setups to me with stock suspension. I will mess around this week and put my stock 245's on the front and see how that fits, because a pure square set up would be sweet to have.
Get an alignment too; that much front tire wear without hard driving or track could be misalignment, and mine tends to need this on a yearly basis (I don't think MP4S will be much different wearing than the MPSS). And post back how this works - I've been wondering about 18x8.5et40 myself.
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      09-11-2020, 05:11 PM   #17
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Quote:
Originally Posted by Maynard View Post
Quote:
Originally Posted by khj24 View Post
I think ill just take the leap after reading through 15 pages of threads I have seen a few people have no issues with specifically the MP4S on similar setups to me with stock suspension. I will mess around this week and put my stock 245's on the front and see how that fits, because a pure square set up would be sweet to have.
Get an alignment too; that much front tire wear without hard driving or track could be misalignment, and mine tends to need this on a yearly basis (I don't think MP4S will be much different wearing than the MPSS). And post back how this works - I've been wondering about 18x8.5et40 myself.
It was dealer aligned when I bought it 12k miles ago, but after seeing the LF vs RF wear I think something might be up. They're both bad, but the left has noticeably more wear. If I'm getting an alignment I feel I might as well get LCA's too...
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      11-30-2020, 04:42 PM   #18
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Quote:
Originally Posted by khj24 View Post
I think ill just take the leap after reading through 15 pages of threads I have seen a few people have no issues with specifically the MP4S on similar setups to me with stock suspension. I will mess around this week and put my stock 245's on the front and see how that fits, because a pure square set up would be sweet to have.
Resurrecting an old post here, but how did this go? I'm considering almost this exact same setup (18x8.5 ET35 Apex FL-5 on stock suspension + ride height) and I want to fit 245 in the front if possible but really concerned about rubbing. Did you fit the 245 in the front and how did it go? Any other mods like spacers/camber adjustments compared to stock?
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      11-30-2020, 06:01 PM   #19
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Quote:
Originally Posted by daneagles View Post
Quote:
Originally Posted by khj24 View Post
I think ill just take the leap after reading through 15 pages of threads I have seen a few people have no issues with specifically the MP4S on similar setups to me with stock suspension. I will mess around this week and put my stock 245's on the front and see how that fits, because a pure square set up would be sweet to have.
Resurrecting an old post here, but how did this go? I'm considering almost this exact same setup (18x8.5 ET35 Apex FL-5 on stock suspension + ride height) and I want to fit 245 in the front if possible but really concerned about rubbing. Did you fit the 245 in the front and how did it go? Any other mods like spacers/camber adjustments compared to stock?
I absolutely love it, I think I made another thread, but it transforms the car. 245/35/18 MPSS all corners 18x8.5 ET39 completely stock suspension.
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