11-29-2020, 03:26 AM | #1 |
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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.. |
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 Last edited by 4Hockey4; 11-29-2020 at 02:00 PM.. |
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11-29-2020, 03:34 PM | #3 | |
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11-29-2020, 07:19 PM | #4 |
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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, 11:17 PM | #6 |
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11-30-2020, 12:13 AM | #7 | |
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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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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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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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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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12-03-2020, 01:01 PM | #14 | |
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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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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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TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; Full PPF |
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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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12-04-2020, 07:53 AM | #18 |
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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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2017 M240i: 25.9K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; Full PPF |
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12-04-2020, 08:25 AM | #19 | |
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12-04-2020, 12:47 PM | #20 | |
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235/40-18 on an 8.5" wheel – A/S 3+ 8.2" & PS4S 8.1"
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2017 M240i: 25.9K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; Full PPF |
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12-07-2020, 01:22 AM | #21 | |
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12-07-2020, 08:05 PM | #22 | |
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