I just need a little help understanding a few measurements - Team Camaro Tech
Wheels & Tires What fits what?

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old Aug 11th, 09, 10:50 AM Thread Starter
Senior Tech
Join Date: Aug 2002
Location: Bonner Springs, KS
Posts: 213
I just need a little help understanding a few measurements

OK, so here's the deal. I'm looking to get into a 17" set of wheels, and a little later I'll be going with disc brakes all the way around. My car is set up with a re-fitted 12 bolt out of a Chevelle, so it's about an inch wider than stock. Therefore, obviously, I can't use "out of the box" '69 Camaro measurements (which I hear is a bad idea anyway).
I got under there with a tape measure, and what I came up with was a 17x9" rim with 5.5" backspacing. However, in looking through the various combos in the sticky thread, I see a ton of guys running a 9.5" wide rim with a 5.5" backspacing. It seems to me that since I have a wider rearend, I should be able to run a similar rim width, but with more backspacing to fill up the wheel well (in theory, anyway). Can anyone help me understand?

On a separate note, running a non-stock rearend certainly limits your choices on wheels, unless you pony up the extra bucks for custom configurations!

'69 Base
427 BBC +.030, 9.x:1 * 228/238 @ .050, .540" lift hyd flat tappet * 2.19" / 1.88" open, iron oval port, #3999241 * Edelbrock Performer RPM * Holley 830 Annular * HEI, Supercoil, 300+ wires * 4200 RPM Flash, TH400 * 3.70 posi 12-bolt
69 Rat is offline  
Sponsored Links
post #2 of 2 (permalink) Old Aug 12th, 09, 05:15 PM
Senior Tech
Join Date: Jul 2009
Location: Corona, CA
Posts: 104
Re: I just need a little help understanding a few measurements

Is the 12 bolt one inch wider on each side or total? If total, then you need to adjust your backspace by .500" on each side, meaning you would need a 9.5 with a 6" backspace.

If it is 1" wider on each side, then adjust the backspace by 1", so 6.5" on a 9.5" wheel. Now remember, when you are measuring wheel widths are always (ALWAYS) 1" wider than what is stated because the wheel beads are not included, so a 9.5" wheel will measure 10.5" overall. Backspace and front space however is computed from the very edge of the wheel. So a 9.5" wheel with a 5.5" backspace, will have a 5" front space.

Hope this helps.
DriverzInc is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome