This will take you to the main site where there is history, technical information and other information on these cars.
This takes you back to the main page of the forums.
This is the control panel to change your password, information and preferences on this message board.
Click here if your lost your password or need to register on this message board. You must be a registered user to post. Registration is free.
Search this board for information you need.
Click here to buy cool Squarebirds mechandise.
Click here to support Squarebirds.org. For $20 annually receive 20mBytes webspace, a Squarebirds e-mail address and member's icon on the message board.
  #1  
Old 04-21-2008, 10:32 AM
GTE427's Avatar
GTE427 GTE427 is offline
Super-Experienced
 
Join Date: Oct 9 2007
Posts: 596
GTE427 is on a distinguished road
Default Bias-Ply tire dimensions

For anyone considering the purchase of bias-ply tires, not all listed tire sizes are dimensionally the same.

The Squarebird standard tire was 8.00x14, optional 8.50x14. 430 w/air were standard 8.50x14.

I've compared Cokers (BF Goodrich) with Universal (Goodyear)

Coker 8.00x14 - 27.58"OD x 4.58"W
Coker 8.50x14 - 28.10"OD x 4.75"W
Universal 8.00x14 - 28.67"OD x 4.95"W

There are more tires available, the Universal Brand and Lester, these sizes vary also with the above.

Depending on your preference, tall or short, price, choose accordingly.

I talked to Coker, the tires are from the original molds, what you get today is the same as 50 years ago, tire sizes back in the day weren't as exacting as today's standards.
__________________
Ken
1959 J Convertible
1960 J Hardtop
Reply With Quote
  #2  
Old 04-21-2008, 08:19 PM
bcomo bcomo is offline
Super-Experienced
 
Join Date: Sep 23 2005
Posts: 1,224
bcomo is on a distinguished road
Default

Any idea of what Coker radials translate to the 8.00 x 14 and 8.50 x 14 bias ply?
__________________
Bart
1960 Hard Top/430
Thunderbird Registry Number 1231
Reply With Quote
  #3  
Old 04-21-2008, 11:19 PM
dgs's Avatar
dgs dgs is offline
Super-Experienced
 
Join Date: Feb 13 2003
Posts: 921
dgs is on a distinguished road
Default

Quote:
Originally Posted by GTE427 View Post
Coker 8.00x14 - 27.58"OD x 4.58"W
Coker 8.50x14 - 28.10"OD x 4.75"W
Universal 8.00x14 - 28.67"OD x 4.95"W
Those width numbers are the tread width, the more important number is the section width. The Coker 800x14 are 8.1 wide, the 850-14 are 8.35 wide.

For modern sized, the section width is the first number of the tire, but it's in millimeters, not inches. 25.4mm = 1in.

I could go into a dissertation on tire sizes, but I've done that before (do a search here on tire sizes, you'll find it. ). The bottom line is that most folks go with either 215/75R14 or 225/75R14. The former is supposed to be close to the 800's, the later the 850's. In reality, they are each a little too short and a little too wide, but they are the best match. I believe that's what Coker recommends as well. They have a handy conversion chart here.

Discount Tire has a neat tire size calculator that can help too.
__________________
DGS (aka salguod)
1960 Convertible - Raven Black, Red leather
www.salguod.net
Reply With Quote
  #4  
Old 04-22-2008, 12:21 PM
tbird430's Avatar
tbird430 tbird430 is offline
Super-Experienced
 
Join Date: Jun 18 2007
Posts: 2,616
tbird430 is on a distinguished road
Post

Here is another GREAT tire sizing calculator I have saved over the years:

http://www.miata.net/garage/tirecalc.html

It ran these facts on these 2 tire sizes.

225/75R14: VS. 215/75R14:

Sidewall 6.6" ~~~~~~~ 6.3"
Radius 13.6" ~~~~~~~ 13.3"
Diameter 27.3" ~~~~~ 26.7"
Circumference 85.7" ~~ 83.9"
Revs/mile 739.0" ~~~ 755.0"
MPH 60MPH ~~~~~~ 58.7MPH

The speedometer on a car running the 215/75R14 tires (compared to a stock 225/75R14 tire) would be reading 2.2% too fast....
__________________

The 1960 Ford Thunderbird. The WORLD'S most wanted car....

VTCI Member#6287.

Last edited by tbird430 : 04-22-2008 at 12:24 PM.
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

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


All times are GMT -4. The time now is 04:55 AM.

Driving, racing or working on cars can be hazardous. The procedures and advice on this website including the message board are opinion only. Squarebirds.org and its webmasters and contributors do not guarantee the correctness of the advice and procedures. The Squarebirds.org and its webmasters assume no liability for any damage, fines, punishment, injury or death resulting from following these procedures or advice. If you do not have the skills or tools to repair your car, please consult a professional. By using this site you agree to hold harmless the Squarebirds.org, its authors and its webmasters from any resulting claim and costs that may occur from using the information found on this site.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Any submissions to this site and any post on this site becomes property of Squarebirds.org . The webmasters reserve the right to edit and modify any submissions to this site. All material on this is site is copyrighted by the Squarebirds.org. Reproduction by any means other than for personal use is strictly prohibited. Permission to use material on this site can be obtained by contacting the webmasters. Copyright 2002-2016 by Squarebirds.org.