Welcome to the North American Subaru Impreza Owners Club Tuesday January 16, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Click here to visit TireRack
Tire & Wheel Forum sponsored by The Tire Rack

Losing traction? Need new tires?
Click here to visit the NASIOC Upgrade Garage...
Go Back   NASIOC > NASIOC Technical > Tire & Wheel

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Thread Tools Display Modes
Old 12-01-2008, 12:50 AM   #1
Redneck Ricer
Scooby Specialist
Member#: 21458
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Boston, Massachusett
2011 Jeep
Smurf Blue

Default 08 Sti: Wheel width vs. Tire width VS. offset and more. HELP!

So I have a decision to make for my 08 STi

I have done research, and gone through threads, but there seems to be conflicting info, and I am hoping someone can help ad clarity!

So stock, the wheels are 18 x 8.5 with 55 offset

stock tires are 245/40/18

So common options people seem to be going with are 18 x 9 or 18 x 9.5, with the stock sized tires, and lower offset (like 29)

now, from my understanding (and I am no expert, which is why I am posting! ), this will push the wheel further out towards the fender, giving it a more 'aggressive' look.

but since you are using the stock tire size, wouldnt this then stretch the tire out too much (ala vw. haha)?

Now, I have also seen that people have used tires as wide as 285's on the stock rims, without rubbing. (and of course the higher offset of 55)

Now, I am getting advan RS wheels, most likely 18 x 9.5. I dont want to use the stock tires, but of course am worried about fit and rubbing

(and also, when going to a different size tire, it will change the overall height a little... but not much, although something to still take into consideration)

it seems, from my research, the best way to go, is get the RS's with the 45 offset (versus the stock 55, and the more 'aggressive' 29 or 35)
And then get a 275/35/18 inch tire

the stock 245/40/18 are 25.7" tall, where a 275/35/18 would be 25.6" tall. not a huge difference - and I also know, depending on what tire brand, that may vary as well

but with the 45 offset, it should push it out a little more than stock, providing a little bit more room on the inside (I would either be doing springs/struts or coils, not keeping it stock, but not lowering it more than 1"), and still give enough room for the tire on the fender side (I dont have an issue rolling the fenders if need be)

So if my thought process and reasoning correct here? Or am I missing something, or looking at it wrong?

anyone with more knowledge and expertise that can chip in, it woudl be appreciated

* Registered users of the site do not see these ads.
Redneck Ricer is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 12-01-2008, 11:26 PM   #2
Scooby Newbie
Member#: 196251
Join Date: Dec 2008
Chapter/Region: NESIC
Location: Northwest CT
2006 STi


Not sure specifically about the '08, but a general tire note is that a stretched tire will have better turn in response, and will actually be faster on the track despite a tiny decrease in overall grip. The stretched tire triangulates the sidewall, so when you turn the rim, there is less delay from sidewall roll to for the contact patch for the tire to develop grip.

downside is it's easier to curb a rim!
maserman85 is offline   Reply With Quote
Old 12-02-2008, 10:20 AM   #3
Redneck Ricer
Scooby Specialist
Member#: 21458
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Boston, Massachusett
2011 Jeep
Smurf Blue


well that I am aware of
But also, there is a point when you stretch too much, and it puts in danger the integrity of the tire
and I think putitng a stock 245 on a 9.5 inch rim is pushing the limit.

Yes, better turn in is good, but if you end up losing all traction since it is stretched too much, then you lose all the benefits of big tires
Redneck Ricer is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
offset vs tire width question. poetic--playa Tire & Wheel 4 03-25-2009 04:01 AM
Legacy Spec B wheel/tire STi tmic,rad and more 99subi Tri-State Area Private Classifieds 17 05-04-2008 11:43 PM
WRX PARTS: Wings West kit, Enkei wheels & Toyo tires, Exedy racing clutch and more malc Private 'For Sale' Classifieds 2 07-21-2005 08:18 PM
Camber vs. Tire Width TurbojonLS Brakes, Steering & Suspension 10 03-03-2005 11:48 AM
Upsizing: Matching wheel width to tire width and adjusting offset sonicblue Tire & Wheel 14 08-16-2004 03:28 PM

All times are GMT -4. The time now is 06:02 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.