Welcome to the North American Subaru Impreza Owners Club Saturday August 23, 2014
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...
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
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.
Reply
 
Thread Tools Display Modes
Old 10-04-2012, 03:07 PM   #2051
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

17x8 +45 would probably be the ideal setup.
* Registered users of the site do not see these ads.
sc00by4life is offline   Reply With Quote
Old 10-11-2012, 02:47 AM   #2052
Frey Bone
Scooby Newbie
 
Member#: 6252
Join Date: May 2001
Chapter/Region: NWIC
Location: Bend, Oregon USA
Vehicle:
2000 GC8 w/STI
Blue

Default Very straight forward question.

Could this thread be more confusing?

If nirvana is:
8.0" ....... +43 to +47 (assuming for a stock suspension set-up)


...and stock STI wheels (05-07) are 8" wide--

Why are the stock wheels +53 offset?

Did I read through ALL 53 odd pages. NO. Did I read through a bunch?

YES.

Did I do a bunch of searches?

YES
Frey Bone is offline   Reply With Quote
Old 10-11-2012, 03:16 AM   #2053
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

Quote:
Originally Posted by Frey Bone View Post
Could this thread be more confusing?

If nirvana is:
8.0" ....... +43 to +47 (assuming for a stock suspension set-up)


...and stock STI wheels (05-07) are 8" wide--

Why are the stock wheels +53 offset?

Did I read through ALL 53 odd pages. NO. Did I read through a bunch?

YES.

Did I do a bunch of searches?

YES
why don't our cars have all forged internals? why aren't the EJ255/7 tunes better? why do USDM sti seats suck? hell, why are upgrades even available for cars?

Things aren't always the "best" from the factory.
sc00by4life is offline   Reply With Quote
Old 10-11-2012, 03:25 AM   #2054
Frey Bone
Scooby Newbie
 
Member#: 6252
Join Date: May 2001
Chapter/Region: NWIC
Location: Bend, Oregon USA
Vehicle:
2000 GC8 w/STI
Blue

Default

Damn, the USDM seats sure do suck, thanks for reminding me.

...so, is it the case the consensus is that +43 - +47 is a "better" offset.

When it comes to offset- (which really isn't explained here btw):

Clear the brakes
Clear the suspension
Doesn't rub on the fender
Isn't hard on the wheel bearings

I'm guessing by better- the 43-47 measure beats the +53 in these facets of fit?

Are there any other aspects I'm missing?

Thank you by the way.
Frey Bone is offline   Reply With Quote
Old 10-11-2012, 04:00 AM   #2055
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

offset doesn't really mean much in terms of brake clearance, that is almost purely based on wheel design.

lower offsets also widen the track of the car, reducing weight transfer.

going too low results in an increased scrub radius and moves the "dave point" away from the center of the contact patch, reducing steering feel and kickback.
sc00by4life is offline   Reply With Quote
Old 10-11-2012, 04:24 AM   #2056
Frey Bone
Scooby Newbie
 
Member#: 6252
Join Date: May 2001
Chapter/Region: NWIC
Location: Bend, Oregon USA
Vehicle:
2000 GC8 w/STI
Blue

Default

...ok, good, I like where this is going.

So- you go too low, and the tire rubs on the fender? -is also harder on wheel bearings?
Frey Bone is offline   Reply With Quote
Old 10-11-2012, 04:35 AM   #2057
Frey Bone
Scooby Newbie
 
Member#: 6252
Join Date: May 2001
Chapter/Region: NWIC
Location: Bend, Oregon USA
Vehicle:
2000 GC8 w/STI
Blue

Default

...is there any formula that correlates offset (in mm) to change in scrub radius?

Most of the information I found on scrub radius talked mostly in terms of ease when parking, or what happens in the event of a braking circuit failure- not in terms of changes in handling while driving + or -
Frey Bone is offline   Reply With Quote
Old 10-11-2012, 04:39 AM   #2058
Frey Bone
Scooby Newbie
 
Member#: 6252
Join Date: May 2001
Chapter/Region: NWIC
Location: Bend, Oregon USA
Vehicle:
2000 GC8 w/STI
Blue

Default

...or better yet- do you know where the Dave point would be on a stock '05 sti relitave to a wheel with say +47 offset?

That is, do you know if the Dave point is inside the center of the tire on the stock +53 wheel/suspension set up?

THANKS!
Frey Bone is offline   Reply With Quote
Old 10-11-2012, 02:14 PM   #2059
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

Quote:
Originally Posted by Frey Bone View Post
...ok, good, I like where this is going.

So- you go too low, and the tire rubs on the fender? -is also harder on wheel bearings?
Whether something rubs on the fender has a few different contributing factors. The combination of wheel width + offset being one of them, the second being tire size.

Quote:
Originally Posted by Frey Bone View Post
...is there any formula that correlates offset (in mm) to change in scrub radius?

Most of the information I found on scrub radius talked mostly in terms of ease when parking, or what happens in the event of a braking circuit failure- not in terms of changes in handling while driving + or -
The change in scrub radius is mostly only noticed at low speed tight cornering. . As far as a formula that directly correlates to track width to how much scrub radius is increased, I'm not exactly sure off the top of my head, but I don't doubt thats it exists somewhere on the internet.

Quote:
Originally Posted by Frey Bone View Post
...or better yet- do you know where the Dave point would be on a stock '05 sti relitave to a wheel with say +47 offset?

That is, do you know if the Dave point is inside the center of the tire on the stock +53 wheel/suspension set up?

THANKS!
A change in 5mm would effectively move the dave point a fraction of that length rearward. Its definitely a subtle difference, but not nearly enough of to outweigh the benefits of the *slightly* wider track. Idealy, the dave point should be just be centered on the tires contact patch. Obviously....there are plenty of ways to adjust the dave point in relation to relative offset, but that is far beyond the average enthusiests understanding of steering and suspension.

Again though.......this is mostly relevant for track cars. Will the average driver notice these things under normal conditions? no.

Last edited by sc00by4life; 10-11-2012 at 03:36 PM.
sc00by4life is offline   Reply With Quote
Old 10-11-2012, 08:58 PM   #2060
DoogieSTi
Scooby Newbie
 
Member#: 247023
Join Date: May 2010
Chapter/Region: MAIC
Location: Ashburn/Springfield
Vehicle:
2007 STi
OBP

Default

07 STi
Coilovers
245/40/17
17X9 et 30 or 42?
Will be rolling front and rears.

Thanks for opinions.
DoogieSTi is offline   Reply With Quote
Old 10-11-2012, 09:26 PM   #2061
DoogieSTi
Scooby Newbie
 
Member#: 247023
Join Date: May 2010
Chapter/Region: MAIC
Location: Ashburn/Springfield
Vehicle:
2007 STi
OBP

Default

^^ Disregard. I read the details wrong. It was +25 not +30. I'm definitely not going that low... Guess I'll stick with +42
DoogieSTi is offline   Reply With Quote
Old 10-11-2012, 10:42 PM   #2062
S1CkWrx
Scooby Specialist
 
Member#: 325249
Join Date: Jul 2012
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2012 wrx
dgm

Default

2012 wrx here. looking at some 18x9.5s or 18x10s will be soon lowered on BC coilovers. just wondering il stay within the 30-40offset range. lower being it will poke more. i just want it inside the fenderwells. im looking at either 235/45/ or a little more beef 245 or 255...
S1CkWrx is offline   Reply With Quote
Old 10-11-2012, 11:26 PM   #2063
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

Quote:
Originally Posted by S1CkWrx
2012 wrx here. looking at some 18x9.5s or 18x10s will be soon lowered on BC coilovers. just wondering il stay within the 30-40offset range. lower being it will poke more. i just want it inside the fenderwells. im looking at either 235/45/ or a little more beef 245 or 255...
Run an 18x9.5, roll all around and have fun going low with a 265.

Still at a loss as why people buy a brand new car and put the cheapest coilovers possible on it.
sc00by4life is offline   Reply With Quote
Old 10-11-2012, 11:47 PM   #2064
S1CkWrx
Scooby Specialist
 
Member#: 325249
Join Date: Jul 2012
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2012 wrx
dgm

Default

car will be on air by the end of winter. just need something to hold me over
S1CkWrx is offline   Reply With Quote
Old 10-16-2012, 06:30 PM   #2065
04reddragon
Scooby Newbie
 
Member#: 216553
Join Date: Jul 2009
Chapter/Region: SWIC
Location: Yuma,Az
Vehicle:
2004 wrx
red

Default

i have 04 wrx with 17x8 running 235/35/17 and no issues future i would like to have 17 8.5 since most have issues with 17 9 and run 245/40 or 45/17 for better handling???
04reddragon is offline   Reply With Quote
Old 10-16-2012, 07:54 PM   #2066
RobNJ36
Scooby Newbie
 
Member#: 326442
Join Date: Jul 2012
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2010 Sti
Silver

Default

I searched and I read...........would appreciate a quick answer. Whats great about this site is all the different opinions it also drives you crazy sometimes. My 2010 Sti stock wheels are 18X8.5 55 offset........I'm getting ready to buy a winter setup. Rim size would be 17x7-17X7.5-or 17X8 depending on which wheel I choose. If I stay with an offset of 45 or higher I should have no issues with brake clearance ???.....The last thing I want to do is ship back 4 wheels. Thank you in advance !!
RobNJ36 is offline   Reply With Quote
Old 10-16-2012, 10:13 PM   #2067
Breezio
Scooby Specialist
 
Member#: 234357
Join Date: Jan 2010
Location: Forest Grove, OR
Vehicle:
2009 WRX
Sportwagen zum einbauen!

Default

It's going to be an individual wheel basis. In a totally generic standpoint, a lower offset will be more likely to clear the brakes. But really, individual wheel design matters infinitely more.
Breezio is offline   Reply With Quote
Old 10-17-2012, 01:10 AM   #2068
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

Quote:
Originally Posted by RobNJ36
I searched and I read...........would appreciate a quick answer. Whats great about this site is all the different opinions it also drives you crazy sometimes. My 2010 Sti stock wheels are 18X8.5 55 offset........I'm getting ready to buy a winter setup. Rim size would be 17x7-17X7.5-or 17X8 depending on which wheel I choose. If I stay with an offset of 45 or higher I should have no issues with brake clearance ???.....The last thing I want to do is ship back 4 wheels. Thank you in advance !!
Offset means literally nothing in terms of brake clearance.

It's ALL based on the wheel design.
sc00by4life is offline   Reply With Quote
Old 10-17-2012, 06:05 PM   #2069
RobNJ36
Scooby Newbie
 
Member#: 326442
Join Date: Jul 2012
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2010 Sti
Silver

Default

Guys..........understood thank you.......So if I order from Tire Rack or Discount Tire the wheels they have in stock specified for my vehicle all should fit with no clearance problems then. I assume they did their homework? 17x7 or 17X8 with a 45 or 47 offset all good ?
RobNJ36 is offline   Reply With Quote
Old 10-17-2012, 09:18 PM   #2070
sc00by4life
Scooby Guru
 
Member#: 97135
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Bothell
Default

why don't you pm Luke@TireRack and have him help you out if you are unsure .
sc00by4life is offline   Reply With Quote
Old 10-18-2012, 08:08 PM   #2071
RobNJ36
Scooby Newbie
 
Member#: 326442
Join Date: Jul 2012
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2010 Sti
Silver

Default

All good...got it sorted out thank you
RobNJ36 is offline   Reply With Quote
Old 10-29-2012, 03:43 PM   #2072
11stikmd
Scooby Newbie
 
Member#: 324246
Join Date: Jun 2012
Chapter/Region: NESIC
Vehicle:
2011 STi
OBP

Default Rota Grid Fitment

Disregard post

Last edited by 11stikmd; 10-29-2012 at 09:00 PM. Reason: Will keep searching threads
11stikmd is offline   Reply With Quote
Old 11-06-2012, 06:19 PM   #2073
Bryan_15
Scooby Newbie
 
Member#: 337192
Join Date: Nov 2012
Location: New Jersey
Vehicle:
2010 Subaru Wrx

Default

Helped a lot
Bryan_15 is offline   Reply With Quote
Old 11-07-2012, 07:38 PM   #2074
bicho_ojo
Scooby Newbie
 
Member#: 268847
Join Date: Jan 2011
Chapter/Region: TXIC
Location: Corpus Christi, Tx
Vehicle:
2005 35r'd STI
Aspen White

Default

I'm looking to purchase enkei RPF1 in an 18 inch wheel what is a good size to where is clears brembos and me not having to rolls fenders also same for a set of NTO3's as well.

Thanks,
Grant
bicho_ojo is offline   Reply With Quote
Old 11-09-2012, 12:33 PM   #2075
Slow Scoobie
Scooby Specialist
 
Member#: 320464
Join Date: May 2012
Chapter/Region: Tri-State
Location: Monmouth, NJ
Vehicle:
09 2.S"low"
Dark Gray Metallic

Default

What kind of fender mods will I be looking at with a 17x9 +25 or +35 offset wheel? On a 08-10 body style sedan With a 235/45 tire. EDIT forgot to mention im on coilovers.

Last edited by Slow Scoobie; 11-09-2012 at 06:21 PM.
Slow Scoobie is offline   Reply With Quote
Reply

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
So I read the Offset thread... Dracon Tire & Wheel 6 11-18-2012 04:39 AM
The Hella Flush Information Thread Impreza2.5i-Kid Tire & Wheel 16 08-23-2010 08:33 AM
The end all 6 speed swap information thread DS1 Transmission (AT/MT) & Driveline 156 11-14-2009 08:21 PM
Can we correct "The Offset Information Thread"? Portly Tire & Wheel 15 02-25-2006 06:48 PM
The Header Information Thread imposter Normally Aspirated Powertrain 315 04-25-2003 02:59 PM


All times are GMT -4. The time now is 04:38 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.