Welcome to the North American Subaru Impreza Owners Club Sunday December 4, 2016
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. 
Reply
 
Thread Tools Display Modes
Old 07-12-2005, 03:39 PM   #1
o2sys
Scooby Guru
 
Member#: 43842
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: NYC
Vehicle:
200? WRX STI
Aspen White

Default Having different tread wear

If you have two tires with less thread then the other two is there any problem???
* Registered users of the site do not see these ads.
o2sys is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-12-2005, 03:42 PM   #2
o2sys
Scooby Guru
 
Member#: 43842
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: NYC
Vehicle:
200? WRX STI
Aspen White

Default

to bee more specific, im getting the same tires all 4 of the same kind with 2 of them with 60% thread left and the other two with 90% thread left.....
o2sys is offline   Reply With Quote
Old 07-12-2005, 03:50 PM   #3
Kean
Scooby Guru
 
Member#: 25187
Join Date: Sep 2002
Location: So. CA
Vehicle:
'08 Foz Prem TGM
'10 Challenger R/T Blk

Default

Check your manual (it's in there). As long as the difference is within the tolerance specified in the book, you should be fine.
Kean is offline   Reply With Quote
Old 07-12-2005, 07:08 PM   #4
o2sys
Scooby Guru
 
Member#: 43842
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: NYC
Vehicle:
200? WRX STI
Aspen White

Default

bump....lost my manual (or cant seem to locate)
o2sys is offline   Reply With Quote
Old 07-12-2005, 07:12 PM   #5
KSwrxWAGON
Scooby Newbie
 
Member#: 56639
Join Date: Mar 2004
Chapter/Region: MWSOC
Location: Olathe, Kansas
Vehicle:
'03 WRX Wagon
Silver

Default

Keep the tires with the same amount of wear on the same end of the car (front/back). If you have different overall diameters on the same axle, you will overwork your differential, causing it to overheat and break. If you have a center diff., which only STi's do, you have to watch all four tire diameters to avoid excessive wear on the diffs.
KSwrxWAGON is offline   Reply With Quote
Old 07-12-2005, 07:35 PM   #6
o2sys
Scooby Guru
 
Member#: 43842
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: NYC
Vehicle:
200? WRX STI
Aspen White

Default

Quote:
Originally Posted by KSwrxWAGON
Keep the tires with the same amount of wear on the same end of the car (front/back). If you have different overall diameters on the same axle, you will overwork your differential, causing it to overheat and break. If you have a center diff., which only STi's do, you have to watch all four tire diameters to avoid excessive wear on the diffs.
So you are saying i can have two of the same worn tires for the front or back and the other two of the same worn tires for the back or front..just dont mixem up right? like 60% on driver side front and 90% pass front....

and i thought the WRX did have the center diff, just cant control it like the STi.....
o2sys is offline   Reply With Quote
Old 07-13-2005, 03:06 AM   #7
GravelRash
Scooby Specialist
 
Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2002 WRX Franknwagen
Grime over Sedona Red

Default

Subaru specs no more than 1/4" difference in tire circumference (mounted and correctly inflated) among all 4 for the WRX. (Ref Subaru.com, My Subaru...set up an account if you don't have one; check out Care Care Tips, then Tire Wear...)

And yes, the WRX does have a center diff, a viscous LS unit - same type as the rear diff, which contributes to the tire size issue.

Given a nominal 25" dia. tire (which is definitely close enough for calculation), a 1/4" difference in circumference will equate to 0.04" difference in tread depth measurement. So, a bit more than 1/32" (0.03125"), but way less than 1/16" (0.0625").

So check 'em out and see if you're within the limits. But if those 60% and 90% figures are correct you won't be (If 10/32" tread depth when new - and it was likely very close to that - then the difference now will be 3/32" - way over the limit.) Presumably you could have the 90% pair shaved enough to bring you w/in the limit, but that may not be worth it.

If you run them anyway? Put the larger pair on the front - higher wear rate, more critical traction. Will you blow a diff on your next trip to the store? No, but you do risk shortening the life of the center diff...and no one can tell you by how much except possibly Subaru.
GravelRash is online now   Reply With Quote
Old 07-13-2005, 12:01 PM   #8
o2sys
Scooby Guru
 
Member#: 43842
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: NYC
Vehicle:
200? WRX STI
Aspen White

Default

Quote:
Originally Posted by GravelRash
Subaru specs no more than 1/4" difference in tire circumference (mounted and correctly inflated) among all 4 for the WRX. (Ref Subaru.com, My Subaru...set up an account if you don't have one; check out Care Care Tips, then Tire Wear...)

And yes, the WRX does have a center diff, a viscous LS unit - same type as the rear diff, which contributes to the tire size issue.

Given a nominal 25" dia. tire (which is definitely close enough for calculation), a 1/4" difference in circumference will equate to 0.04" difference in tread depth measurement. So, a bit more than 1/32" (0.03125"), but way less than 1/16" (0.0625").

So check 'em out and see if you're within the limits. But if those 60% and 90% figures are correct you won't be (If 10/32" tread depth when new - and it was likely very close to that - then the difference now will be 3/32" - way over the limit.) Presumably you could have the 90% pair shaved enough to bring you w/in the limit, but that may not be worth it.

If you run them anyway? Put the larger pair on the front - higher wear rate, more critical traction. Will you blow a diff on your next trip to the store? No, but you do risk shortening the life of the center diff...and no one can tell you by how much except possibly Subaru.

thanks....so in the end is not worth the risk i guess, i found the manual last night and was reading about it....but this helped more....
o2sys is offline   Reply With Quote
Old 07-14-2005, 06:55 PM   #9
GravelRash
Scooby Specialist
 
Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2002 WRX Franknwagen
Grime over Sedona Red

Default

Cool; sorry to bust up your party
GravelRash is online now   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
Front/Back Tire Tread Wear Difference on '03 WRX Protocol Tire & Wheel 6 09-03-2005 02:04 PM
newbie tire question...tread wear rateing mdot Newbies & FAQs 6 02-10-2003 01:15 PM
Tread wear on Falken Azenis? erice1984 Brakes, Steering & Suspension 9 05-15-2002 04:21 PM
Falken Azenis - Tread Wear travmn Brakes, Steering & Suspension 11 04-09-2002 01:23 AM
Tread wear problem MattJP Brakes, Steering & Suspension 1 05-28-2001 08:17 AM

All times are GMT -4. The time now is 08:57 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.