My wheel setup and what tires size
 

Ok I got rid of my 19's for some 18 RPF1 18x9.5 +15 and 18x10.5 +15. I saw Megan running this same setup up front with no issues on AP BBK. He told me he had 3mm clearance. Well after I installed the out side lower edge corner only of my AP caliber was ever so slightly rubbing the inside of the wheel where it angles inward. This is how close it was, the wheels had been plasti dipped and the plati dip was rub clean but no marks what so ever on the wheels. It looks as if the caliper had a slight molding issue for it wasn't round and smooth as the upper corner. Again Megan had clearance. It actually has a small hook like look. I almost thought of grinding down a tad. But t thought of that on my AP's is hard to manage.

So I'm going to run these wheels and spacers are going to be needed to ease the mind and as my buddy Mike mentioned you want some clearance for small rocks can get caught between the caliber and the rim making awful noise which has lead him to black flags before. I was thinking of 2.5mm spacers but my buddy had some 5mm he gave me. So that's what's on there and that's how it's going to be so no grief just help on tire sizes please.

I want to run a square tire setup of 285/35/18. Shouldn't his work up front? I really like to get a 285/40 but that tire size seems hard to come by with the few brands I will only run. I have coilovers so adjusting height is no issue. I ask cause the great info here is spread far and wide with different scenarios. But now with my total offset at +10 I had to ask. I will be running -3.0 camber also.

ive tested 18x10.5 et23 with 275/35/18 up front at -3 camber with no rubbing. 10.5 at et23 is the same outside clearance as 9.5 et10. thing is 285/35/18 is a wider and taller tire then the 275/35/18 i was running. But on a side note i feel 285 is too wide for 9.5, leading to crappy sidewall dynamics and not maximizing the actual width of the 285. i wouldnt run 285 on anything less then a 10, ideally on 10.5 which is what im running now. Also, when i do run 275/35/18 ( my Maxxis RC1 since thats the biggest size they make right now) i spacer out my rear 10.5 et15 to et5, -2 camber back there also no rubbing

Subbed...I just got the exact same wheel setup :)

Well I orders some RS3 's 285/35. I'm sure it will be fine. Going to run -3 or more camber up front. The manufacture recommends a 9.5 wheel and up for 285.

your tires shipped, they will be at my shop on Wednesday.

I'll be there Friday with wheels and $.

the range for the 285/35/18 RS3 is 9.5-11, so the 9.5 is at the bottom of the range, and i know for a fact, even ask Martin, the "285" Rs3s are over 290mm, they are prolly the widest "285" street tire around, Hence why i recommended 10.5 which i run myself.

My setup is RPF1 , 10.5 x 18" square with the rs3 285. No rubbing at all, but I do not have camber settings either. Will be interesting to see what happens with drop+ camber.

I'm sure I'll be good. Tires are here. Picking them up tomorrow. But my wheels will be waiting to get powder coated.

My 285's are a little poochy on my 10" rears, I think on a 9.5 they'd be ridic, but it probably depends hugely on the tire.

LMK what you think of those RS3's. I can't wait to get rid of these 19's and get RPF1's.

It won't be nothing. I was already running a 275 and it was flush with the wheel so this will be about 1/4" more on both sides.

I went with Enkei PF01 18x10.5 +38 front +15 rear. I test fit the +38 front recently over the sport brakes and it seemed like it fit fine without the 10mm spacer I originally ran them on but I will have to put them on a drive a bit to see for sure. For tires I have Toyo R888 275/40-r18. As you said, the 40's are hard to find. I wanted NT01's or RE-11's but they just were hard to get ahold of. Unfortunately I have my car lowered and can't get up my driveway with the slight additional drop the 35's would give me. I also don't feel like lugging my rims/tires to the track to put em on there.

I hear ya man, getting really damn sick of swapping wheels lol.

Everyone going square, hmmm...

I wanted to run the bfgoodrich Gforce rival since tire rack has it beating the re11 in every dry test. Seems I have to be 275/35 or 295/35 to be square or maybe stay staggered with those numbers. They seem light too. The re11 only has a comparable size in the 275/35 but its 2 pounds heavier :).

I can tell your turbos are not installed yet since you want to go square on the tires!

So why do I feel like the odd-man-out.

I am running square with Enkei PF01 9.5 x 18 ET35 with 0.5" spacer on the front and 1" spacer on the rear on 265/35R18 Yoki A048 because I have an opinion that anything more will over-tyre the car ....

I'm never going to run FI, even if (when) I put the car on a diet and give it a dose of steriods, because our class reg's on this side of the Pacific don;t permit it.

Indeed, if I stay in Production class, my maximum wheel size is only 9" x 18" and tyre choice is limited to R-Spec rather than full slicks.

I use "little" tyres so the CoG is lower without having to worry about suspension arm angles, and it helps with gearing - the effective final drive ratio with the 265 tyre is 3.92:1 and I don't have to open the diff housing ....

The old setup was 8.5 front with 245/40R18 and 9.5 rear with 275/35R18 and that was severely grip-limited at the front ... with 265 all round, is is "nicely balanced" and I don;t see the need to go 275 or 285 (although 285/30R18 will drop the car another 8mm and in theory improve mechanical grip and drop final drive to 4.02:1).

Is my name actually Fuller Schitt or does my logic have some basis in fact ???

Doran racing seems to do well with 245/275, look into his setup. I'm sure any setup can be made to handle with proper arms, camber, toe, caster, sways, springs, valving, etc etc.

They'd kill for more front tire.

They're limited because those are the sizes Grand Am would allow.

Correct. He talked a lot about rules too so if doran can get by with rules, so could he.

Got em.

My friend did extensive testing on the rivals, the only time the rival is faster is on lighter cars that don't overheat the tires (miatas etc). He tests on an s2k, and was slower than the Rs3. So I am staying far away from the rivals and they are MORE expensive than the rs3.

What do you guys think about 285 ds3's all around on the stock sport wheels? I know 18s are better but love my rims.

on stock wheels I would run 275 Square

Thanks that's what I figured but I wanted to be greedy I'm tired of the back end coming out. Maybe I can do 275/295.

This will be my first square setup. I'm going to see what the hype is. Course need my car running to find out.

Good to know

Interested to hear later.

If I could sell my front HTR z111 255/40's I'd like to do square 285/35 and see if I can feel a difference in a DD setup.

since your going to run staggered wheel widths, the front contact patch will still be narrower.

295 hoosiers fit on the stock wheels, all the way around

Personally, I am very far away from needing FI as a driver at the road courses I do. Even with turbo/super a square setup is still a good option though so I don't know what you mean unless you are talking drag racing.

Now, if you are talking drag racing/zooming onto entrance ramps, then yeah a square setup makes no sense. On street I run staggered, waste of money to run 285 square on street driving.
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Bow chicca bow-bow

I only meant that once boosted.. the power that these cars make needs as much tire as you can fit! Then again, with how much this particular IRS cambers on compression, I am not sure how much the extra rubber really matters when it isnt touching the ground!

This x 1000.

I had my first autocross (hard launches) since I changed suspension set up (a LOT less rear suspension squat) and its the first time I haven't been able to roast through first and into second, and I'm N/A and making more power and tq than I ever have.

This suspension just adds camber so fast when compressed that it's hard to put power down, no matter how fat your tires are. I think this is why some people have worse straight line traction when they go to larger tires...

Hi guys! sorry for bring this thread from the dead lol! I have a question and I already search a lot but can't find the answer. I'm going to buy some wheels, the wheels specs are 18x9.5+22 & 18x11+16. I want to know what is the best tires combo for this wheels for the track and the street, my car is daily soo haha!. I was thinking to install 265/35/18 and 285/35/18 cause here in PR find a tire more than 285/35 is like find gold :( My question is... I can run those tires with out having problems with the traction control? My suspension setup is basic... Swift Spec R springs, stock shocks and SPC rear camber arms. Thanks

You shouldnt really have a choice. You need to keep the tires 10-20% over the wheel and within 0.3% of each other front to rear. This is proper and correct.

265/35,315/30 Toyo888's

295, 305 or 315 square!

Run the 285's on all 4 corners.

Hi I am actually thinking to run 285/35/18 square but having headache to get right size rims. What is your rim spec(Front and Rear) and do you use any spacer in the back to make it not "sunk"?

I am looking at Advan TCiii18x10.5 offset 25 now but get info the front may rub (Suspension still stock yet so not much camber i can adjust). It would be great if you can share your experience. Thank you for the help!

My rims are 18x10.5 +30 and I run 15mm spacers on the rear. +25 up front should work but 27 plus would better.

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Thanks a lot for the info guys! One more question... If I go with 285/35/18 on front, with my 18x9.5+22 wheels, they are going to rub with the fender liners? I dont have camber plates on front... I know that the rear setup works great... If someone have pics of the 285/35 on the front are going to be great! :tup:

Thanks!