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Old 04-16-2019, 07:21 PM   #1
seba112233
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Default Wheel fitment and rubbing for idiots?

Hi, this is very stupid I am aware but instead of enlightenment I've simply confused myself to no end by reading all the wheel fitment posts. It's my first time doing this.

So on a 15+ WRX many are fitting 18x9.5 +38 and I think 255 35 r18. Many owners also require fender rolls usually in back they say. So I was thinking I'd like to avoid doing this on a brand new car for daily driving, but don't want my rims to look like a bag of d*cks either.

Anyway I guess I'm really confused where the rubbing is happening so I don't know what to aim for when choosing wheels. The ones that I really like are Advan RGIII and I thought 18x9 +35.. with willtheyfit.com it shows 3.3mm less poke and 9.3mm further from strut. So is this basically going to have the same issue because it is so close to the outside as the common fitment people use?

That wheel is also available in +45 offset but that puts it 0.7mm closer to strut and 13.4mm less poke, I guess it's possible to use a spacer like 5mm which would make it 8mm less poke and 4.3mm further from strut

I'm almost ready to give up cause I'm that frustrated with my own ignorance. I'd just go with an 18x8.5 but at the cost of RGIII I worry I'll lose some of the concave face look and just spend a bunch of money to be unhappy with what I've done lol. Pls help unconfuse my dumb ass
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Old 04-16-2019, 07:24 PM   #2
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Someone who knows what they're talking about will respond shortly, but I like to stay as close to stock offset as possible unless you understand what happens when you start messing with suspension geometry.
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Old 04-16-2019, 07:31 PM   #3
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Fill out your profile so we know where in the world you live. Also, post in your regional forum so people in your area can suggest a shop to visit and ask these questions.
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Old 04-16-2019, 07:35 PM   #4
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Ok fair enough, will do
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Old 04-16-2019, 07:49 PM   #5
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15+ WRX can fit that wheel fairly easily. A roll flat on the rear fenders wouldn't hurt, especially if you're going to lower it, and also since you want 255s.

If a concave face is what you want, then 9.5 wide it is.
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Old 04-16-2019, 08:03 PM   #6
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just some datapoints for you

my friend's STI:
-volks TE37 18x9.5 +38 wheels
-255/35/18 tires
-coilovers, lowered height
-no fender rolling
NO RUBBING

my WRX:
- volks ZE40 18x9.5 +38mm wheels
- 265/35/18 tires
- coilovers, lowered height
- fenders rolled
REARS RUB

- Advan RZII 18x9.5 +35 wheels
- 245/40/18 tires
- coilovers, lowered height
- fenders rolled
NO RUBBING
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Old 04-16-2019, 08:04 PM   #7
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Quote:
Originally Posted by kos View Post
15+ WRX can fit that wheel fairly easily. A roll flat on the rear fenders wouldn't hurt, especially if you're going to lower it, and also since you want 255s.

If a concave face is what you want, then 9.5 wide it is.
So the 1/2" makes a big difference then for the look of the face? I mean in comparison to 9" wide which Advan offers, I figured the full inch on 8.5 definately would
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Old 04-16-2019, 08:12 PM   #8
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Quote:
Originally Posted by seba112233 View Post
So the 1/2" makes a big difference then for the look of the face? I mean in comparison to 9" wide which Advan offers, I figured the full inch on 8.5 definately would
Depends on which Face and Offset they are.

I have Advan RS-DF Progesssive on my GD Chassis WRX, 18x9.5 +22 Face 5, which is the most concave.

I just checked Mackin Industries' site, and according to their RG3 size chart, both 5x100 and 5x114.3 in a 9.5 width are a +45 offset, and doesn't state which face they are.

I had a set of RG3s when I was still 5x100, and 9.5 width was the most concave face there was (at least for that bolt pattern).
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Old 04-16-2019, 08:24 PM   #9
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Just to put things into numerical numbers for you. For every half inch wheel width difference, you'll also need a 6.35mm offset difference also to keep the same poke fitment. Don't worry about the wheels hitting the struts, normally the issue is the tires rubbing on the outer fenders.

a typical fit is 18x9.5 +38 wheel and 255/35/18 is a close fit without any rubbing or fender rolling. If you want the equivalent in 18x9 wheels, you can go as low as +31mm offset. Anything lower, it will rub without fenders rolled. If you go with +45mm offset, that's pretty tucked into the car.

Personally, I wouldn't mess with spacers and just get the wheels correct the first time.
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Old 04-16-2019, 09:13 PM   #10
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Quote:
Originally Posted by iluvbeanz View Post
Just to put things into numerical numbers for you. For every half inch wheel width difference, you'll also need a 6.35mm offset difference also to keep the same poke fitment. Don't worry about the wheels hitting the struts, normally the issue is the tires rubbing on the outer fenders.

a typical fit is 18x9.5 +38 wheel and 255/35/18 is a close fit without any rubbing or fender rolling. If you want the equivalent in 18x9 wheels, you can go as low as +31mm offset. Anything lower, it will rub without fenders rolled. If you go with +45mm offset, that's pretty tucked into the car.

Personally, I wouldn't mess with spacers and just get the wheels correct the first time.
Ok, I've seen many here objecting to spacers in my reading so I'll just take them out of consideration. I guess with those RGIII it's so close I won't know unless I try. So how much are you lowered and how much is your friend's STI lowered if you don't mind me asking?
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Old 04-16-2019, 09:22 PM   #11
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Quote:
Originally Posted by kos View Post
Depends on which Face and Offset they are.

I have Advan RS-DF Progesssive on my GD Chassis WRX, 18x9.5 +22 Face 5, which is the most concave.

I just checked Mackin Industries' site, and according to their RG3 size chart, both 5x100 and 5x114.3 in a 9.5 width are a +45 offset, and doesn't state which face they are.

I had a set of RG3s when I was still 5x100, and 9.5 width was the most concave face there was (at least for that bolt pattern).
Hopefully my idea of concave enough is not the same as yours lol. I just see so many WRX locally with either the stocks or some aftermarket wheel that just looks really flat and honestly I think it ruins a very nice car. Hope to avoid that, but I don't need to go extreme either. I also had trouble finding the face spec for the RGIII, I'll browse through the Yokohama website once more maybe just missed it somehow.
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Old 04-16-2019, 10:07 PM   #12
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Going by Yokohamas site, which is hard to read, those 18x9.5 +45 RGIII would be in super GTR face (most concave) and 18x9 +35 is GTR face so middle of the pack, standard is just called standard lol.


This car is what got me into the RGIII.. but he looks very very low to my eye and maybe that's what's making it look so good to me


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Old 04-21-2019, 04:00 PM   #13
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I have knock off nt03 from jnc. They are 18 9.5 +35 on 255/35/18 and I have zero rub in any condition. I am stock ride height tho. There is a bit of wheel gap but as I researched the way Iím set up can have lowering springs no lower than 1 inch without rubbing or rolling fenders. You will have to get used to seeing maybe a couple mmís of poke tho. This is such a sketchy game without just throwing them on and seeing yourself. Kinda sucks. Sometimes your the perfect fit and others your the example of what not to do.
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Old 04-23-2019, 10:41 PM   #14
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Yeah at first I figured I'd just go with the RGIII 18x9.5 +45 offset, it's 7mm less poke than +38 and might even avoid rubbing. Only issue I have is justifying the cost. Instead I see gram lights 57c6 still kicking around a couple shops for a lot less. Downside will be they are +38 offset so I have to accept a very likely fender roll, and if I ever wanted to upgrade brakes I'd be screwed and would have to replace rims. I've come to terms with both, mainly because big brake kits are big bucks, even the schemes involving used calipers is a bit too much for a simple daily driver IMO.. though I might change my mind on that if I end up cooking the brakes in the mountains, since I've done that to my previous ride before.
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Old 04-24-2019, 12:47 PM   #15
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you should really go into the tire and wheel thread... People would be happy to help. Plus you can look at peoples set up and see what you like/dislike.

From what I've seen, wheels that are 9 inch plus in width, tend to be more concave, and anything less than that is flat. There are some instances where the 9.5 wheel width tends to be flat facing. All depends on the type of wheel, brand etc.

255/35/18 18x9.5 +38MM offset is pretty standard for a 15+ WRX with no height adjustment. You should have no problem. You should also be able to go to a 265/35/18 with no problem. If you do lowering springs, (I would suggest) any of the known ones (Swift Spec R, RCE) will give you about a drop of an inch, and with the 255/38mm tire/wheel combo should STILL not rub.

Even at 35MM you should be OK, for that size tire. I would also recommend getting an alignment to adjust camber slightly in the front. You'll need lower control arms to adjust rear camber, to make sure they fit "perfect"

The WRX should run same bolt pattern (5x114.3) as newer STI's so you just have to do research if the wheels "clears brembo's" if you're looking to get a big brake kit. I WOULDN'T suggest that because at that point your pockets just got 3-4k ligther. You piece together something similar for less. If you wanted the big brake kit, you should have just gotten an STI.
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Old 04-24-2019, 09:31 PM   #16
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Looking at getting some 18x10 +25 on my +40mm wider gc8 with aftermarket suspension. Is this even possible to do
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Old 04-24-2019, 09:40 PM   #17
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10Ē??? On an awd car, why?
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Old 04-01-2020, 01:22 PM   #18
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Not to jump anybodies thread but, I and looking at the same things. First, If I am asking anything dumb, please say so as I am new to Subi's ...coming from heavily modded DSM's. I have a leased '17 STI that I was going to buy and keep, now I've changed my mind and it's going back and I'm waiting on a new 2020 STI....which I will buy and keep when the new lease is up. I have a set of new wheels that I was going to use on the '17 and will use on the '20 instead. I have a set of WedsSport TC105X in 18x9.5 +45 which will keep the geometry as close to stock as I can. I getting myself into a tizzy about tire sizes. I will not lower it at all and I don't want to roll the fenders. I'm mixed between 245/40-18, 255/35-18, 255/40-18 and 265/35-18. I would really like to run the 265's.

Last edited by Subidoo57; 04-01-2020 at 01:41 PM.
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Old 04-01-2020, 02:01 PM   #19
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If you're not going to lower your ride 255/35/18 will look too thin (short).
You're better off with stock size, 255/40, 265/35 in that order.

245*.40 = 98mm
255*.40 =102mm
255*.35 = 89mm
265*.35 = 93mm
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Old 04-01-2020, 02:52 PM   #20
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oichan,

Thank you very much for the answer. I have a friend/neighbor and he also went to a 18x9.5 and stayed with the stock size tire 245/40-18. That is listed as acceptable by the tire manufacturer and it doesn't look too crazy stretched.
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Old 04-03-2020, 12:22 PM   #21
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Quote:
Originally Posted by Logan07324 View Post
Looking at getting some 18x10 +25 on my +40mm wider gc8 with aftermarket suspension. Is this even possible to do
I'm running 18x10 -25 Work VS-MX, but im also on bags... anything is possible bro
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Old 04-03-2020, 06:13 PM   #22
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I can understand 10" wide wheels when the driver is serious enough about handling/cornering, but not with such a small offset that leaves all that extra room on the inside basically going to waste.


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Last edited by Norm Peterson; 04-18-2020 at 08:16 AM.
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Old 04-17-2020, 07:29 PM   #23
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Quote:
Originally Posted by seba112233 View Post
Hi, this is very stupid I am aware but instead of enlightenment I've simply confused myself to no end by reading all the wheel fitment posts. It's my first time doing this.

So on a 15+ WRX many are fitting 18x9.5 +38 and I think 255 35 r18. Many owners also require fender rolls usually in back they say. So I was thinking I'd like to avoid doing this on a brand new car for daily driving, but don't want my rims to look like a bag of d*cks either.

Anyway I guess I'm really confused where the rubbing is happening so I don't know what to aim for when choosing wheels. The ones that I really like are Advan RGIII and I thought 18x9 +35.. with willtheyfit.com it shows 3.3mm less poke and 9.3mm further from strut. So is this basically going to have the same issue because it is so close to the outside as the common fitment people use?

That wheel is also available in +45 offset but that puts it 0.7mm closer to strut and 13.4mm less poke, I guess it's possible to use a spacer like 5mm which would make it 8mm less poke and 4.3mm further from strut

I'm almost ready to give up cause I'm that frustrated with my own ignorance. I'd just go with an 18x8.5 but at the cost of RGIII I worry I'll lose some of the concave face look and just spend a bunch of money to be unhappy with what I've done lol. Pls help unconfuse my dumb ass

I’m running 18x9.5 +35 Aodhan AH09 with 265/35/18 tires on a stock height 2015 STI Launch Edition. I have zero rubbing anywhere. No fender roll, no modifications of any kind. I did add a 56 to 73 Hub Centric Ring, though. I do have a bit of poke. So if you would prefer a more flush fit, I’d go with a +38. A buddy of mine has a stock height 2015 STI and his fit right at flush.
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Old 05-26-2020, 10:10 AM   #24
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Quote:
Originally Posted by SubieKing4 View Post
Iím running 18x9.5 +35 Aodhan AH09 with 265/35/18 tires on a stock height 2015 STI Launch Edition. I have zero rubbing anywhere. No fender roll, no modifications of any kind. I did add a 56 to 73 Hub Centric Ring, though. I do have a bit of poke. So if you would prefer a more flush fit, Iíd go with a +38. A buddy of mine has a stock height 2015 STI and his fit right at flush.
I donít understand this... everyone says 9.5 +38 will be flush. But mine poke WAY out!! Is it because Iím not lowered and cambered yet? I bought these specs expecting flush, which I did not get. Unless my idea of flush is incorrect
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Old 05-26-2020, 10:29 AM   #25
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Quote:
Originally Posted by Mdoonan View Post
I donít understand this... everyone says 9.5 +38 will be flush. But mine poke WAY out!! Is it because Iím not lowered and cambered yet? I bought these specs expecting flush, which I did not get. Unless my idea of flush is incorrect
Is this just the wheels, or is it wheels with tires mounted?

If it's with tires, can you provide a couple of pictures?

It is possible to measure camber yourself, to find out what you're dealing with here.


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