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Old 12-20-2010, 02:20 PM   #1
shu_chen4
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Question Wheels gurus: need help understanding inboard fitment of 17x10

I currently have 18x9.5 +44 wheels with 275/35 tires. I'm considering a move to 17x10 +35 wheels with 275/40 tires and need a little help understanding why I'll have inboard fitment issues with stock struts.

The change in offset will push the wheel out 0.35", which will cover the 0.25" increase in the width of the wheel. I don't currently have issues with the wheels/tires rubbing the struts, so why would I have issues with the new set up? Everything I've read suggests I'll need coilovers to make the 17x10 wheels work.

thanks,
Shu
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Old 12-20-2010, 02:31 PM   #2
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http://www.1010tires.com/WheelOffsetCalculator.asp

according to that
you have more room on the inside(only 3mm) negligeable
however the outer side will come out much more
so just be worried about the rim face side

15mm isnt alot/too hard to fit, roll your fender if you havent, and negative camber will help
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Old 12-20-2010, 03:08 PM   #3
shu_chen4
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Yep, that's what I've gathered by looking at various online calculators, as well. I just wonder if there is another aspect to wheel specs that I'm missing that would cause strut clearance issues.
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Old 12-20-2010, 03:11 PM   #4
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yes, higher offsets effect strut clearance, lower offsets effect fender clearance. you'll need to roll all around for sure, possibly pull in the rear with that tire combo. you wont have inboard fitment, it will be outboard - there will be fender clearance problems (rubbing + more).

ultimately, you should be having coilovers for that kind of wheel fitment due to both aesthetics (that wheel/tire combo looks retarded at stock height) and performance (being able to get more camber with camber plates, etc).

also - i would not recommend 275's for a daily driven vehicle.
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Old 12-20-2010, 03:15 PM   #5
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Quote:
Originally Posted by sc00by4life View Post
and performance (being able to get more camber with camber plates, etc).

also - i would not recommend 275's for a daily driven vehicle.
you can not adjust rear camber with camber plates on the 08+ subarus, only the front camber can be adjusted by camber plates.

and yes a 275 is a little over kill for a street car but it does look badass
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Old 12-20-2010, 03:26 PM   #6
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I don't want this to turn into a discussion about why I shouldn't run this wheel/tire combo. Different strokes for different folks, let's just leave it at that. There are enough threads on this and other forums for that argument.

I just wanted to get some clarification about inboard fitment since I've only read that I must use coilovers in order to clear a 17x10 wheel, though all the calculations I've run suggest otherwise.
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Old 12-20-2010, 03:56 PM   #7
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you should not have inboard fitment problems with the 17x10 if your not already having them with your current set up, as far as your set up it is a little much for the street but i respect the fact that your running 275s on those wheels and not 225s like alot of those herrafrush bros .
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Old 12-20-2010, 11:15 PM   #8
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there will be outboard clearance issues (as i stated). and you need coilovers to get the car to look right. jdmboy- thanks for the info on the camber plates. what changed?

you'll need to roll, and with that extremely stupid tire size a possible pull in the rear.
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Old 12-20-2010, 11:38 PM   #9
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Lots of talk, but we all know do a fit check.Should be close
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Old 12-20-2010, 11:42 PM   #10
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these will help you in regards to outboard clearance

18x10 +38 with 285/30/18s on topspeed's GR sti - http://t3hclap.com/archives/51
18x10 +35 with 295/30/18s on iag's GR sti - http://www.iagperformance.com/PROJECT_08_STI.html
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Old 12-21-2010, 12:04 AM   #11
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Well aware of the outboard issues I'll run into; again, I'm interested in hearing any first-hand accounts of the inboard issues I may encounter based on research I conducted prior to opening this thread. I guess anyone using this wheel fitment is going to use coilovers, so I'll probably have to figure this out on my own if I choose to pursue this path. By the way, I never once said this was going to be a daily-driven setup.

Thank you all for your replies, well except for sc00by4life, since you seem to want to play Internet antagonist.
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Old 12-21-2010, 12:08 AM   #12
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i answered your question twice already (this is why you came to the forum...to learn from people with experience, right). There will not be any inboard issues with that fitment. I have a feeling what you were reading was regarding a more "proper" offset (40+) and fitment with that width and tire size. With the offset you are looking at (et35), the outer position of the wheel will sit 15mm further out, and you will gain 3mm of inner clearance vs. your current set-up. If you are running 275's at the moment with no issues, than you should also not have any issues regarding the fitment of the set-up you are looking at (in fact, you'll have MORE inner clearance).

and since the outer position of the wheel moves out 15mm (towards the fender), that is the reason we brought up fender clearance. you will (obviously) need to modify your fenders.
is that better?

Last edited by sc00by4life; 12-21-2010 at 12:14 AM.
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Old 12-21-2010, 12:15 AM   #13
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if you're not having any inboard issues with an 18x9.5 +44, you won't have any issues with a 17x10 +35.
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Old 12-21-2010, 12:27 AM   #14
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I get it, trust me, I do. I've done the research, I've been on these forums a long time and understand the potential pitfalls of running wide wheels and tires. I also know to ask a question only after I've exhausted all forms of search. I was merely hoping someone with ACTUAL experience with a GR STI and this wheel fitment would chime in. This closest I've found is this fella:

http://www.iwsti.com/forums/3039729-post37.html

and he doesn't think the wheels would work with stock struts.

A discussion here with the unofficial official of wheel fitments also states a 10" wheel requires coilovers:

http://www.iwsti.com/forums/gr-tires...set-17x10.html

So, yes, based on all the calculations, I shouldn't have a problem, but real world experience may suggest otherwise. Again, I was hoping someone with this real world experience with the EXACT setup in question would chime in.
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Old 12-21-2010, 12:55 AM   #15
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Its pretty accurate math. You are gaining inboard clearance, and the overall rolling diameter is very close. I have experience with a wide range of wheel fitments, and from what my experience is telling me (by purely running the numbers) that it will fit.

Again, if you aren't having issues now with the same tire size on a higher offset wheel, you won't at a lower offset. Its pure logic, you are creating MORE room between the strut and the inner edge of the wheel.

Check out the links nhat posted, those are examples of cars running close to the same set up with more tire.

Quote:
Originally Posted by IAG sti
# 18 x 10 x 35mm Rota Boost
# 295 x 30 x 18
# Front & Rear Fender Roll & Pull

and that car is on springs, so he has the same strut clearance than you do, with a much more aggressive set-up.
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Old 12-21-2010, 01:21 AM   #16
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Yep, you're right, didn't notice the IAG car was on Cobb springs. Good catch.
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Old 12-22-2010, 11:48 AM   #17
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Quote:
Originally Posted by sc00by4life View Post
jdmboy- thanks for the info on the camber plates. what changed?
the struts in the rear are no longer attached to the knuckles, they are attached to the A frame of the suspension therefore leaning the strut from side to side (what a camber plate does) no longer effects camber. you have to get a camber kit like this one http://racecompengineering.com/osc/p...roducts_id=104 to adjust rear camber in an 08+ wrx or sti
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