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your link doesnt seem to be what you thought it would be..?...But im glad to see you found something that works for you
.......CHEERS!!
 

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Just ordered some 18x8.5 +48 offset wheels for my 07 wrx. What tire size should I go with? Will 245/40/18 fit ok or should i do 235 or 225. Suspension is stock struts with swift springs.
 

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Discussion Starter #43
245/40R18 will NOT fit OK. They're much too tall. I'd go 225/40R18 or 235/35R18 or if you want to roll your fenders 245/35R18 or 255/35R18.
 

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Thanks so much!! This actually answered my questions!!! Had just put Forester struts on my '07 WRX wagon, with new 17x7.5 +48 wheels, and wanted to know if I can go up to a 225/45R17. Think I'll do that soon!!
 

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I just have a quick question, I have a 2010 WRX and I have a set of Rims that used to be on my 95 Talon TSI AWD, they are 16"x7 offset +38mm tire size is 225/50 R16 the diameter seems okay but the offset is way lower than stock, I was just wondering if I mounted those and used them if any problems would occur and would handling be better or worse? From what I was told handling would be better cause the wheels would be further out and it would ride a bit wider. Please let me know if any of its correct. Thanks!
 

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If the are the correct bolt pattern, the offset is too low and the wheels are narrower than stock. This will reduce tire options and hurt performance. Don't.
 

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Discussion Starter #50
Wider suspension is better, but changing wheels doesn't change the suspension. The best offset is the stock offset because it's the offset for which the suspension was designed to work. Reducing offset to "widen" the stance of the car does not generally improve handling. The suspension geometry is adversely effected. To correctly widen the track of the car, the suspension would need to be modified. And not just by changing parts, the entire geometry would need to be redone.
 

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Hi.
Fender clearance. Will I have enough? It seems pretty close.
2011 subaru impreza 2.5i premium
OEM was
Tires, 205/55/16. Rim, 16x6.5 offset +55
Aftermarket now
Tires, 225/45/17. Rim, 17x7.5 offset +48
Thanks for any info/opinions.
I can't wait for some snow this year! (In Chicago)
 

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Discussion Starter #52
no you won't have any trouble with that setup assuming the wheels are made for a Subaru (5x100, correct center bore, lug nut shape)
 

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Wider suspension is better, but changing wheels doesn't change the suspension. The best offset is the stock offset because it's the offset for which the suspension was designed to work. Reducing offset to "widen" the stance of the car does not generally improve handling. The suspension geometry is adversely effected. To correctly widen the track of the car, the suspension would need to be modified. And not just by changing parts, the entire geometry would need to be redone.
New member here....Hello!!

Mosc: Great information man! Thanks!!
I noticed you have a 2015 sti...still stock. I was wondering if you were looking for wheels tire combo right now what would you choose, based on all the infor you have given us, I am curious to see what you would choose. I am new to the subaru world and mods, so I really appreciate all of this info and your input.

Thanks!!
 

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Discussion Starter #55
My situation? I am sticking with the stock 18x8.5" +55 wheels (cause they're free and nobody would give me decent money for em thanks to their mediocre stock tires) and I bought a set of 07 STi wheels (17x8" +53 clear brembos 5x114) to use in the winter with 245/45R17 Pirelli Winter Sottozero 3. That's not exactly the question you're asking though.

What would I buy for the track? The 08-14 STi could handle 265 width at near stock offset without fender rolling or hitting the strut. You can't find that width for a 17" wheel so if I was going to get new tires/wheels I'd be looking at an 18x9" or 18x9.5" wheel that cleared brembos and had basically as much offset as I could get. If you could find say 18x9" +48, I think you could run 265/35R18 and clear the fenders. The 2015 is new but the fender clearance appears to be somewhat similar. I think on the 2015 you could do the same.

The negative there is the tire height. The stock height is 25.7" and the STi's gearing is overly tight. 265/35R18 is just 25.3". I'm actually considering 255/40R18 on the stock wheels though strut clearance at that height (26.0") at +55 offset worries me. I'd actually prefer 255/45R17 if I could find and afford 17x8.5" +48 5x114 wheels and they made a decent tire in that size (which they don't so it's moot). 275/35R18 seems to fix everything but it's awful wide and requires an awfully wide wheel which I can't imagine having an offset that wouldn't make me puke. Also not sure how the fenders would handle it. 18x9.5" decent offset wheels and 275/35R18 tires is not a cheap option either. Or a nimble one for agility on public roads dodging potholes.

So all that said 245/40R18 on 18x8.5" +55 isn't all bad even if stock doesn't sound very ideal to most people.

The WRX, in all it's years, is a different balance of tire width, wheel offset, fender clearance, gearing, and brake clearance so keep that in mind if your car isn't exactly mine. For example, the 02-05 WRX came with 16x6.5" +53 wheels and 205/55R16 all season 25" tall tires on overly tall gearing. The difference going to a performance summer tire that was 235 wide and shorter (235/45R17) was biblical. The fenders were the same as the JDM STi to boot, which was 235 wide stock. 17x8" +48 to +55 offset 5x100 wheels are cheap and easy to find as well so there was no reason NOT to do it. As I said, my 2015 STi isn't going to easily slap on 30mm more width from a far superior tire for little money and no clearance issues like an 02-05 WRX could. It's pushed already.
 

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no you won't have any trouble with that setup assuming the wheels are made for a Subaru (5x100, correct center bore, lug nut shape)

Hello.. New member to subies and wrx's!

My tires are due to be changed.. Just been doing research on fitment ### id like to get a new set of wheels..u have very Good info, uve provided lots of insight ..

I think my only concern is offset and how u say it will alter the geometry as well as inaccuracy of speedo reading.. Id be using the car for Daily driving, no tracking.. Id like to keep suspension stock.. Maybe mod it in later future..
I understand you strongly advocate against lower offsets.. Im looking at an aesthetic build without sacrificing too much handling by just altering the rims.. But options are limited here in Australia without having to buy online

I was initially looking at xxr530's 18x8.75 offset+ 38

What sort of suspension mods would need to be installed to acccomodate the rim and maintain handling?


And if you really advise against the xxr's.. I was looking to fit

OZ Racing ultralegera 18x8.5s offset +48

^would that be ok with your fitment recommendations?

Ahh and my model is the 2011 wrx.. Both rims are 5X100
 

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Discussion Starter #57
I advise against XXR's because they're a junky cast (they break/leak/crack) and that's not enough offset for a subaru. 2011 WRX can handle 18x8.5 +48 very well. I'd use a 255/35R18 tire on it. I'm assuming you have the pulled fenders the USDM got in 09+ WRX models as opposed to the original 08 WRX fenders.
 

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I advise against XXR's because they're a junky cast (they break/leak/crack) and that's not enough offset for a subaru. 2011 WRX can handle 18x8.5 +48 very well. I'd use a 255/35R18 tire on it. I'm assuming you have the pulled fenders the USDM got in 09+ WRX models as opposed to the original 08 WRX fenders.


Thanks a lot for the advice.. I have a 2011 wrx.. Are u asking if the fenders of the 2011 Australian version are based on the 09 USDM? Because im not sure.. Where could i find out?
 

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you could take a picture of your car, that always works
Fyi.. That dents been fixed.. Lol

And just curious.. What modifications would need to be made to accommodate lower offsets so that handling is maintained? As well as a closer to accurate speedo/odo reading?
 

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