Rear Tire fitment for 67 442 - ClassicOldsmobile.com


Wheels and Tires Sponsored by Tire Rack
Click Here

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old March 11th, 2017, 06:59 PM   #1
Registered User
Thread Starter
 
Join Date: Sep 2013
Location: Islip ny Long Island
Posts: 99
Rear Tire fitment for 67 442

I am hoping some one can help me with this problem. I am trying to find out what rim and tire size to buy to be able to fit the largest tires possible in the rear of my 67 442. I have read a few posts on this site but I am still a little confused. I want to buy the aftermarket 15" SSI rims. I have QA1 adjustable coil overs front and rear so have some room to adjust the height, but want the car sitting as close to factory height as possible with just a subtle rake to it. Has anyone gone down this road who can recommend the proper back spacing and possibly a rim manufacture that they used. I have been seeing a lot of people saying that a 4.5" back space will allow for the wides tire, but I get confused on the tire sizes. Also my car is a convertible so I am not sure that if that makes a difference. Any help or advice would be greatly appreciated.
Thanks Paul
Tallpaul67 is offline   Reply With Quote
Old March 12th, 2017, 05:09 AM   #2
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 25,060
Quote:
Originally Posted by Tallpaul67 View Post
I have been seeing a lot of people saying that a 4.5" back space will allow for the wides tire, but I get confused on the tire sizes. Also my car is a convertible so I am not sure that if that makes a difference. Any help or advice would be greatly appreciated.
Thanks Paul
This discussion comes up a LOT. You need to understand that the measurement you care about is OFFSET. Backspace is a useless measurement unless you also know rim width, since wheels of different width that have the same offset will have different backspace measurements. You need a wheel with near zero offset.





joe_padavano is offline   Reply With Quote
Old March 12th, 2017, 08:21 AM   #3
Registered User
 
Join Date: Mar 2008
Posts: 3,180
On my 66 442, I run 30x9 Hoosier drag slicks on 9" wheels with 4-3/8" backspace. The rear is the narrower type like used on 66 Chevelles. If you run the wider Olds width rear, BS should be about 4" ON A 9" WHEEL. If you use an 8" wheel, for example, split the difference in wheel width and you get a 3.5" BS with the wider rear, or about 4" with the narrow rear. That tire is the biggest that will fit easily/safely to clear the frame and wheel opening lips. You may have to trim the front edge of the wheel well at the bottom (rocker panel area) for that diameter (95" circumference).
Run to Rund is offline   Reply With Quote
Old March 12th, 2017, 08:27 AM   #4
Registered User
 
Join Date: Mar 2008
Posts: 3,180
BTW, I have run wheels from 8" to 10" wide and have varied the offset a bit over the years, about +/- .125" so you may have to fine tune for your individual car. I have a number of wheels with stock centers and with HD centers that I have used over the years, but they are in Vegas, not too close to LI.
Run to Rund is offline   Reply With Quote
Old March 12th, 2017, 02:30 PM   #5
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 25,060
Quote:
Originally Posted by Run to Rund View Post
On my 66 442, I run 30x9 Hoosier drag slicks on 9" wheels with 4-3/8" backspace. The rear is the narrower type like used on 66 Chevelles. If you run the wider Olds width rear, BS should be about 4" ON A 9" WHEEL.
I think you have that reversed, Joe. The wider rear will push the tires closer to the outer fender lip, and a smaller backspace (for the same wheel width) pushes the tire ever further towards the outer fender lip. You'd want a larger backspace with the wider Type O axle to keep the tire centerline in the same place.
joe_padavano is offline   Reply With Quote
Old March 18th, 2017, 06:16 PM   #6
Registered User
Thread Starter
 
Join Date: Sep 2013
Location: Islip ny Long Island
Posts: 99
Re: tire fit

Hi guys, thanks so much for the replies. I will have to do a little more research but that information definitely helped.
Tallpaul67 is offline   Reply With Quote
Old March 19th, 2017, 07:38 AM   #7
Registered User
 
Join Date: Mar 2008
Posts: 3,180
Yeah, thanks. With the wider rear, BS would be about 4.8" for a 9" wheel.
Run to Rund is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rim tire fitment question Big Dawg Wheels and Tires 3 May 7th, 2016 02:54 PM
Homemade tire fitment tool joe_padavano Wheels and Tires 6 September 3rd, 2015 09:30 PM
1971 98 Wheel/Tire Fitment 455rocketv8 Ninety-Eight 2 April 25th, 2014 05:28 AM
1964 Olds F85 Tire Fitment Question Brians64f85 Wheels and Tires 1 November 15th, 2012 11:53 AM
Wheel and tire fitment 72 supreme Rolds72 Wheels and Tires 0 March 13th, 2012 03:26 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -7. The time now is 11:26 AM.


All content Copyright 2008 by Internet Brands, Inc.