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      11-29-2020, 03:26 AM   #1
daneagles
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Tire fitment for 18x8.5 ET35 wheels

I bought a set of Apex 18x8.5 ET35 wheels on Black Friday and was planning on a 225 square setup to clear the front strut as recommended by Apex and others online. But now I've seen many people online claim to run 245 square setups and have no issues with rubbing in the front. I'm on completely stock suspension and will be running Pilot Sport 4S all around. Can someone confirm whether 245 tires will clear the front strut? If you've done it yourself, can you confirm how much clearance there is between the tire and strut? I really want to fit it if I can, but also really concerned about rubbing.

Edit: I should mention that the tires will always be Pilot Sport 4S, regardless of the size. If you're posting about your fitment experience please let me know which tires you used, because the Michelins run wider than most other compounds.

Last edited by daneagles; 12-20-2020 at 11:44 PM..
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      11-29-2020, 01:50 PM   #2
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Some swear it can, but I went 235/40 PS4S on 18 8.5 ET 40 (net, ET43 with 3mm spacer)) Not close to rubbing to fender. Plenty have run above, couple went 245

I also plan on doing some light track events, and didn't want it "close"

Both BMW and local race shop said the 245 was iffy, but again some have done. Also do the wheel sealant, nice difference to protect and easier cleaning, like 30 minutes when new/clean.year or 2 of coverage.

I used Gtechniq C5

https://www.2addicts.com/forums/show....php?t=1765519

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      11-29-2020, 03:34 PM   #3
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Quote:
Originally Posted by 4Hockey4 View Post
Some swear it can, but I went 235/40 PS4S on 18 8.5 ET 40 (net, ET43 with 3mm spacer)) Not close to rubbing to fender. Plenty have run above, couple went 245

I also plan on doing some light track events, and didn't want it "close"

Both BMW and local race shop said the 245 was iffy, but again some have done. Also do the wheel sealant, nice difference to protect and easier cleaning, like 30 minutes when new/clean.year or 2 of coverage.

I used Gtechniq C5

https://www.2addicts.com/forums/show....php?t=1765519
I run 235/40/18 on et42 wheels. No rub at all. By accident I also ran 245/35/18 on the stock fronts 7.5x18 for 6 weeks. No rub, but nit safe to run 245 on 8" width.
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      11-29-2020, 07:19 PM   #4
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Originally Posted by ralawren View Post
I run 235/40/18 on et42 wheels. No rub at all. By accident I also ran 245/35/18 on the stock fronts 8x18 for 6 weeks. No rub, but nit safe to run 245 on 8" width.
The stock fronts are 7.5 and the wheels I'm asking about are 8.5 (not 8), but agreed that 245 on the stock wheel is a bad idea. Wondering if maybe 235 square on 8.5" ET35 might be the best choice overall? Better than 225 square and with less risk of rubbing than 245
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      11-29-2020, 09:09 PM   #5
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The 235 will fit on an 8.5 wheel at 35 offset, but you may need more neg camber depending on your ride height.
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      11-29-2020, 11:17 PM   #6
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Originally Posted by aftercorbu View Post
The 235 will fit on an 8.5 wheel at 35 offset, but you may need more neg camber depending on your ride height.
I'm at stock ride height. Sounds like 235 square is an almost guaranteed fitment but 245 is probably too tight in the front?
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      11-30-2020, 12:13 AM   #7
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Originally Posted by daneagles View Post
I'm at stock ride height. Sounds like 235 square is an almost guaranteed fitment but 245 is probably too tight in the front?
I just went through this same process a couple weeks ago. I almost rolled the dice on a 245/35 square setup with Apex ARC-8’s 18x8.5 et38. I ended up ordering 235/40’s and I will have them mounted and ready by this Wednesday. From everything I read, it seems to be 100% successful fit at stock height but I will report back once I put them on. — I run 245’s square in the summer with no issues on a 17” wheel but with et40.

I think the et35 with a 245 would likely require camber or rolled fender, but a few members here have fit a 245/35 square setup with 18x8.5 Et45 with 5mm spacers up front with zero issues. I would have gone that route but as a mostly winter setup and really rough roads where I live, the extra sidewall and easy fit won me over.
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      11-30-2020, 12:02 PM   #8
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I have not ordered mine yet. But with my research 245 is doable but with 39 offset being perfectly in the middle between suspension and fender. So any wheel 38 to 42 offset should work. Your wheels are 35mm which is about 4mm closer to the fender than perfect so it may rub at the fender, especially on hard turns.
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      11-30-2020, 01:46 PM   #9
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Quote:
Originally Posted by PeanuKeeyes View Post
I just went through this same process a couple weeks ago. I almost rolled the dice on a 245/35 square setup with Apex ARC-8’s 18x8.5 et38. I ended up ordering 235/40’s and I will have them mounted and ready by this Wednesday. From everything I read, it seems to be 100% successful fit at stock height but I will report back once I put them on. — I run 245’s square in the summer with no issues on a 17” wheel but with et40.

I think the et35 with a 245 would likely require camber or rolled fender, but a few members here have fit a 245/35 square setup with 18x8.5 Et45 with 5mm spacers up front with zero issues. I would have gone that route but as a mostly winter setup and really rough roads where I live, the extra sidewall and easy fit won me over.
Thanks for the details, I'm going to reach out to Apex to confirm but it sounds like 235 is probably the widest I can safely fit without extra mods or risk of rubbing. If you wouldn't mind, could you report back after fitting your 235 square setup on how the fitment is and whether you have any rubbing?
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      12-01-2020, 09:39 AM   #10
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I run 245/35/19. 19x8.5 +35. So same width and offset but slightly larger diameter from the 19" wheel. It clears the strut just fine, still have a finger or so of clearance. The rim is actually a hair wider than the tire still. Also I'm on stock suspension.
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      12-01-2020, 04:44 PM   #11
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Originally Posted by Mark.h View Post
I run 245/35/19. 19x8.5 +35. So same width and offset but slightly larger diameter from the 19" wheel. It clears the strut just fine, still have a finger or so of clearance. The rim is actually a hair wider than the tire still. Also I'm on stock suspension.
After a ton of research it seems like the issue with running 245 front on this car is more about rubbing on the fender, not so much the strut. Going from 225 -> 245 only moves the tire <3mm closer to the strut so I don't think it will rub on the strut, but at 35 offset on an 8.5" width wheel you're pushing the rim ~23mm out towards the fender which scares me. Good to hear that you have no problems clearing the strut on 245, but how about rubbing on the fender? Can you hit full compression without rubbing or is it pretty sketchy?
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      12-02-2020, 02:51 PM   #12
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Quote:
Originally Posted by daneagles View Post
Thanks for the details, I'm going to reach out to Apex to confirm but it sounds like 235 is probably the widest I can safely fit without extra mods or risk of rubbing. If you wouldn't mind, could you report back after fitting your 235 square setup on how the fitment is and whether you have any rubbing?
I put them on just now.. they look good but I’m really disappointed with the amount of poke out back with ET38. These Michelin pilot sport a/s 3’s are pretty wide. They are almost exactly the same width as the 245 Hankook R-S4’s.. the 8.5 width wheel and the extra bit of offset vs the 8” wide ET40 on the R-S4’s makes it very aggressive by comparison. no rubbing yet and the front is darn near perfect but still on the poke side. If I could do it again, I would go with ET45 and put the 5mm spacers up front.

Again, perfect example of how the tire really is key to all this. This tire with ET35 would be a disaster. Definitely no go.
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      12-02-2020, 03:40 PM   #13
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yea right on the edge, I'm at net ET41 front with 235/40 PS4S, and its just barely inside top of fender. ET38 would flush, and ET35 would poke.
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      12-03-2020, 01:01 PM   #14
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Quote:
Originally Posted by PeanuKeeyes View Post
I put them on just now.. they look good but I’m really disappointed with the amount of poke out back with ET38. These Michelin pilot sport a/s 3’s are pretty wide. They are almost exactly the same width as the 245 Hankook R-S4’s.. the 8.5 width wheel and the extra bit of offset vs the 8” wide ET40 on the R-S4’s makes it very aggressive by comparison. no rubbing yet and the front is darn near perfect but still on the poke side. If I could do it again, I would go with ET45 and put the 5mm spacers up front.

Again, perfect example of how the tire really is key to all this. This tire with ET35 would be a disaster. Definitely no go.
Looks great, I like a meaty look and the tire poking slightly enhances this IMO! I think the A/S 3+ is running significantly wider than the PS4S, these are my rears 235/40r18 on 18x8.5 ET 35 Fl-5s (square all around).


I do have a slight drop with Dinan springs, rear camber is -1.5 and I rub the fronts on the outer fender edge on hard impacts. Nothing major but something to note (front camber is -0.7). The fitment is definitely aggressive.
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      12-03-2020, 03:21 PM   #15
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Originally Posted by CarbonLion View Post
I think the A/S 3+ is running significantly wider than the PS4S, these are my rears 235/40r18 on 18x8.5 ET 35 Fl-5s (square all around).
Since I've got both A/S 3+ and PS4S tires, I thought I'd look to see what Tire Rack lists for tread widths. This is what they show:

235/40-18 on an 8.5" wheel – A/S 3+ 8.2" & PS4S 8.1";
245/35-18 on an 8.5" wheel – A/S 3+ 8.8" & PS4S 8.4"; and,
255/35-18 on a 9.0" wheel –– A/S 3+ 9.3" & PS4S 8.8".
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      12-03-2020, 07:45 PM   #16
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Interesting. So I don’t know what I’m talking about here, just started looking into this lol, but apparently there is a spec for section width and another for tread width. Not always listed for everything. My Hankook R-S4’s have a tread width of ~ 9.1” vs Section width of ~ 9.7“ over a 8” wheel, according to hankook’s website. The A/S3+ has a section width of 9.5” over a 8.5” wheel, according to Michelin’s website. — If these specs are accurate then shouldn’t my set of A/S3+ sit the same in the arches as the R-S4’s? Maybe I’m missing something obvious... I thought I had crossed my T’s and dotted my i’s before this purchase but hey, the stance is growing on me, and more importantly, the tires drive great.
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      12-04-2020, 05:10 AM   #17
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Quote:
Originally Posted by daneagles View Post
Quote:
Originally Posted by Mark.h View Post
I run 245/35/19. 19x8.5 +35. So same width and offset but slightly larger diameter from the 19" wheel. It clears the strut just fine, still have a finger or so of clearance. The rim is actually a hair wider than the tire still. Also I'm on stock suspension.
After a ton of research it seems like the issue with running 245 front on this car is more about rubbing on the fender, not so much the strut. Going from 225 -> 245 only moves the tire <3mm closer to the strut so I don't think it will rub on the strut, but at 35 offset on an 8.5" width wheel you're pushing the rim ~23mm out towards the fender which scares me. Good to hear that you have no problems clearing the strut on 245, but how about rubbing on the fender? Can you hit full compression without rubbing or is it pretty sketchy?
I rub slightly on big dips at high speed 75+. Id be willing to bet that with the 18" set up you would be fine. My set up is an entire inch taller than yours, half an inch closer to the fender than your set up would be. I know tire manufacturing widths can vary slightly but for my set up, running hankooks, the tire itself isn't poked out past the fenders at all its tucked in. The rim pokes slightly with the +35 offset.
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      12-04-2020, 07:53 AM   #18
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Originally Posted by PeanuKeeyes View Post
If these specs are accurate...
Good point. Even though they sometimes don't have the data for a given tire or tire size, for tread widths I go to Tire Rack for the reasons they explain here: https://www.tirerack.com/tires/tiret...jsp?techid=201.

I like the idea of one measuring technique being used to measure all of the tires carried by TR.
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      12-04-2020, 08:25 AM   #19
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Quote:
Originally Posted by dradernh View Post
Good point. Even though they sometimes don't have the data for a given tire or tire size, for tread widths I go to Tire Rack for the reasons they explain here: https://www.tirerack.com/tires/tiret...jsp?techid=201.

I like the idea of one measuring technique being used to measure all of the tires carried by TR.
I went through all of this and even chatted with TR tech. I went 18 8.5 and 235/40 and compared AS3 and PS4S. He said ground contact was virtually the same.
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      12-04-2020, 12:47 PM   #20
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Quote:
Originally Posted by 4Hockey4 View Post
I went through all of this and even chatted with TR tech. I went 18 8.5 and 235/40 and compared AS3 and PS4S. He said ground contact was virtually the same.
That's consistent with their site showing tread widths of:

235/40-18 on an 8.5" wheel – A/S 3+ 8.2" & PS4S 8.1"
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      12-07-2020, 01:22 AM   #21
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Quote:
Originally Posted by PeanuKeeyes View Post
I put them on just now.. they look good but I’m really disappointed with the amount of poke out back with ET38. These Michelin pilot sport a/s 3’s are pretty wide. They are almost exactly the same width as the 245 Hankook R-S4’s.. the 8.5 width wheel and the extra bit of offset vs the 8” wide ET40 on the R-S4’s makes it very aggressive by comparison. no rubbing yet and the front is darn near perfect but still on the poke side. If I could do it again, I would go with ET45 and put the 5mm spacers up front.

Again, perfect example of how the tire really is key to all this. This tire with ET35 would be a disaster. Definitely no go.
Interesting... this makes me think that 235/40 PS4S on 8.5" ET35 is probably just barely doable. If A/S 3+ is 0.1" wider than PS4S and you say that ET38 is just barely flush, then 3mm further out on a ~4mm less wide tire should also just barely be flush. This is gonna be tight either way... will update this thread in spring when I switch back to new FL-5s and Pilot Sport 4S.
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      12-07-2020, 08:05 PM   #22
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Quote:
Originally Posted by daneagles View Post
I bought a set of Apex 18x8.5 ET35 wheels on Black Friday and was planning on a 225 square setup to clear the front strut as recommended by Apex and others online. But now I've seen many people online claim to run 245 square setups and have no issues with rubbing in the front. I'm on completely stock suspension and will be running Pilot Sport 4S all around. Can someone confirm whether 245 tires will clear the front strut? If you've done it yourself, can you confirm how much clearance there is between the tire and strut? I really want to fit it if I can, but also really concerned about rubbing.

Side question: do I need coilovers as well to run camber plates, or is it possible to do on stock suspension? How is the NVH compared to stock? I'd be willing to get camber plates if NVH isn't significantly harsher than stock but not planning on getting coilovers for this car. Other than camber plates, are there other mods that would allow for camber adjustability in the front? Car is a daily driver with regular weekend "spirited" drives and plans for some track/autoX before selling.
my m240i came with ground attack camber plates on the front and swuare 245's on 8 inch wheels, and the fronts ever so slightly rubbed. i swapped to enkei rpf1's 18 inch 8.5 wide and put 225's on the front and 245's on the back and that works fine. i actually think that when these tires go ill do 235's on the front and 255's on the back.
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