Tire Size 15x8 Not on Data Sheet - Chevelle Tech
Wheels & Tires What fits what?

 3Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 28 (permalink) Old Jan 21st, 20, 7:46 PM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Tire Size 15x8 Not on Data Sheet

Hi guys,

I checked the data base on my 15" rims and the one guy who comes close looks like the suspension was changed.

72 Skylark:
15x8. Back spacing looks to be about 3"

What are my tire options?

I want to polish these rims and clear powder coat them, but I don't want to put effort in if these rims are no go.

Thanks as always for your help:

https://drive.google.com/file/d/1f2_...ew?usp=sharing

https://drive.google.com/file/d/1ewx...ew?usp=sharing

https://drive.google.com/file/d/1evT...ew?usp=sharing



Thanks in advance
mromaus is offline  
Sponsored Links
Advertisement
 
post #2 of 28 (permalink) Old Jan 22nd, 20, 10:06 AM
Senior Tech Team
Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 5,051
Garage
Re: Tire Size 15x8 Not on Data Sheet

Usually 8" Wide Wheels need 4.25" to 4.5" to Center the Wheel/Tire Combo in the Rear Wheel Wells

Measuring your car's Wheel/Fender Wells on both sides will provide us with the #s
that will enable us to cal the Max sized Tire and the proper Wheel BackSpace

Take the following measurements with the Wheels/Tires off the car;
1. Total Space of Wheel/Fenderwells, from Frame/Fender on the INside
TO the OUTside Inner Lip of the Outside Fender = ?
DR side = ?? and Passenger side = ?? as they can be different
2. The OutSpace for/from the Outside Fender Inner Lip
TO the Face of Rear Brake Drum/Hub/Wheel Mounting Surface = ?
DR side = ?? and Passenger side = ?? as they can be different
3. The INSpace from the Face of Rear Brake Drum/Hub/Wheel Mounting Surface
TO the Inner Fender / Frame = ?
DR side = ?? and Passenger side = ?? as they can be different

NOTE there can be interference from the Lower Shock Mount Bolt if the Wheel is to Wide
and the Exhaust Piping may also rub on the Sidewall of a Tire that is to Wide
plus Ride Height plays into how Wide a Tire will be allowed to be used

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Kirk's67SS is offline  
post #3 of 28 (permalink) Old Jan 22nd, 20, 6:12 PM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Re: Tire Size 15x8 Not on Data Sheet

Thanks! I will try to do this in the next few weeks.

In the mean time I am looking at another set of rims off a 1982 Camaro.

These are 15 X 8.5. I just have to see what good back spacing is (I will look that up on the data sheet).

https://atlanta.craigslist.org/eat/w...054307975.html

These are not as unique as the others I have.

At the same time if I can fit 215/60/15 tires on these rims I might go that route because they are commonly available tires.



Thanks for your help!

Last edited by mromaus; Jan 22nd, 20 at 6:37 PM.
mromaus is offline  
 
post #4 of 28 (permalink) Old Jan 23rd, 20, 8:28 AM
Senior Tech Team
Jeff
 
Join Date: Jun 2009
Location: Pittsburgh, Pa.
Posts: 2,528
Re: Tire Size 15x8 Not on Data Sheet

They don't look like they will work, not enough back spacing..
Kirk's67SS likes this.
hydro462 is offline  
post #5 of 28 (permalink) Old Jan 23rd, 20, 9:21 AM
Tech Team
Lew
 
Join Date: Nov 2015
Location: Potomac, MD
Posts: 938
Garage
Re: Tire Size 15x8 Not on Data Sheet

A 215 that may be too small a tire for an 8.5 inch. Or did you mean like a 245?
Lew540 is offline  
post #6 of 28 (permalink) Old Jan 23rd, 20, 9:38 AM
Senior Tech Team
 
Join Date: Feb 2005
Location: Michigan
Posts: 7,800
Re: Tire Size 15x8 Not on Data Sheet

15" Camaro wheels that vintage should be damn near zero offsets. Should work fine. I can't see the pictures so not sure what style you are looking at.

Tighten it till it strips and back it off a quarter turn.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


67

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


70 (SOLD)

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Alwhite00 is offline  
post #7 of 28 (permalink) Old Jan 23rd, 20, 10:05 AM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Re: Tire Size 15x8 Not on Data Sheet

215 was for the rims I currently have that are 15x8 with 3" backspacing.

Looking at the data sheet it looks like I have a little more play with the 15x8.5 rims.
mromaus is offline  
post #8 of 28 (permalink) Old Jan 23rd, 20, 12:34 PM
Senior Tech Team
Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 5,051
Garage
Re: Tire Size 15x8 Not on Data Sheet

Marco are you trying to have the same size of Tires on the Front & Rear of your Car ?

and are you sure the Wheels on the car now are 8" Wide and not 7" ??

how old are the Tires that are currently on your Car ???

And as Lew has said in Post # 5 a 215 Tire Max Width Wheel is 7" Wide
https://www.jegs.com/i/BF-Goodrich/131/35841/10002/-1

The 215/60/15 Tire is only 25.16 in Diameter
VS
a 245/60/15 Tire is 26.58" in Diameter which has a Max Width Wheel of 8.5"
https://www.jegs.com/i/BF-Goodrich/131/99620/10002/-1
if there is Room within your car's Wheel Wells
and would only increase the Speedometer Reading from 65 to 68.7 mph from the 215 Tire
https://www.discounttiredirect.com/l...ize-calculator

plus would fill up those big Wheel Wells a little more in your car IMHO

BackSpace and Wheel Width with the right Diameter Tire is very important on whether the Wheel/Tire Combo
will fit within your Car's Wheel Wells with no Rubbing issues
if the Car's Ride Height has been lower from Factory stance
and when turning the Front Wheels/Tires to the max

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Kirk's67SS is offline  
post #9 of 28 (permalink) Old Feb 2nd, 20, 6:34 PM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Re: Tire Size 15x8 Not on Data Sheet

Hi guys, finally got around to taking those measurements.

I am very curious to see what you come up with, also I would really like to know the math behind this if you can share.

1. Total Space of Wheel/Fenderwells, from Frame/Fender on the INside
TO the OUTside Inner Lip of the Outside Fender = ?

Dr: 18.5" Pas: 18"

2. The OutSpace for/from the Outside Fender Inner Lip
TO the Face of Rear Brake Drum/Hub/Wheel Mounting Surface = ?
DR side = ?? and Passenger side = ?? as they can be different

Dr: 5.5" Pas: 4 3/4

3The INSpace from the Face of Rear Brake Drum/Hub/Wheel Mounting Surface
TO the Inner Fender / Frame = ?

Dr: 10" Pas:12

I'm sure as you can imagine there is a margin of error to consider with these measurements considering how awkward they are. The measurements were done with a tape measure and a level.

Thanks again!
mromaus is offline  
post #10 of 28 (permalink) Old Feb 2nd, 20, 11:08 PM
Senior Tech Team
Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 5,051
Garage
Re: Tire Size 15x8 Not on Data Sheet

Marco those #s do not make sense
..........................DRside...............Pas sside
OUTspace = #2 .... 5.5".................. 4.75"
INSpace = # 3 ..... 10" .................. 12"
Total Space = ..... 15.5" ............... 16.75"
VS
Your # 1 says Total = 18.5" ........... 18"

I understand the difference from the DR side vs the Pass side as the Rearend maybe not centred
and that a 72 Skylark Wheel Wells are bigger/more flared than a Chevelles

But when you add the # 2 measurements with the # 3 measurements they should be the same as the Total for # 1s

Did you have the Rear wheels off the car when measuring ?

I hang a weighted String Taped to Innerside of the Outside Fender then measure from it to ;
1. the Frame for the Total Space
2. the Face of Rear Brake Drum/Hub/Wheel Mounting Surface for the OUTside Space

and then I hang a weighted String Taped to the Face of Rear Brake Drum/Hub/Wheel Mounting Surface then measure from it to ;
3. the Inner Fender / Frame for the INside Space

Example - my 67 Chevelle measurements ;
1. TOTAL Wheel Well Space = 13"
2. OUTside Space = 5.92"
3. INside Space = 7.08"

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Kirk's67SS is offline  
post #11 of 28 (permalink) Old Feb 3rd, 20, 1:03 PM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Re: Tire Size 15x8 Not on Data Sheet

That is super helpful!

I think I may have misunderstood the process. I will get on it this weekend.

One question; should I take these measurements down the center or off to the side?

So on my car where the suspension and wheel hub start the frame bends out a little, pushing the wheel hub away from the frame on both sides. That could be why my lengths are so long, I took the measurements off center.

Thanks again!
mromaus is offline  
post #12 of 28 (permalink) Old Feb 3rd, 20, 10:47 PM
Senior Tech Team
Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 5,051
Garage
Re: Tire Size 15x8 Not on Data Sheet

Center

In line with the middle/dead center of the Face of the of Rear Brake Drum/Hub/Wheel Mounting Surface / Rearend Housing Tubes

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Kirk's67SS is offline  
post #13 of 28 (permalink) Old Feb 9th, 20, 9:00 PM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Re: Tire Size 15x8 Not on Data Sheet

Hi guys,

Here are my second attempt at the measurements. There still might be some error but these are much closer than the first time now that I had a better idea of what I was after. I hung a string from the top of the fender as suggested. My guess is that the difference between the measurement is likely some error on my part. Maybe the string was positioned slightly different.


..........................DRside............... Pass side
OUTspace = #2 .... 4 7/8" ................ 4 3/4"
INSpace = # 3 .....12 1/2" ................12 1/2"
Total Space = ..... 17 3/8" ............... 17/ 1/4"

Thanks again for the help!
mromaus is offline  
post #14 of 28 (permalink) Old Feb 10th, 20, 1:44 PM
Senior Tech Team
Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 5,051
Garage
Re: Tire Size 15x8 Not on Data Sheet

Marco
that INSpace # of 12.5" seems really High and I do realize it is a 72 Skylark
but I thought that it was a A Body Car like our Chevelles
and therefore the Rear Wheel Wells measurements would be similar/close

Did you have the Wheel/Tire off the car when measuring ?

If you look at my # 10 Post the INside Space on my Chevelle = 7.08" and that is with a Rearend that is 60" Wide
Driverside Face of Brake Drum/Wheel Mounting Surface to Passengerside Face of Brake Drum/wheel Mounting Surface

What is the Width of your CAR'S Rearend Face of Drum or Disc Brake Face / Mounting Surface of Wheel
on Driverside to Passengerside

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Kirk's67SS is offline  
post #15 of 28 (permalink) Old Feb 10th, 20, 3:51 PM Thread Starter
Tech Team
Marco
 
Join Date: Oct 2019
Location: Georgia
Posts: 83
Garage
Re: Tire Size 15x8 Not on Data Sheet

OK..

Now I am confused.

Don't we want to know what fits in the front because that is more restrictive, not the back?

Is it the back wheels that are more restrictive?

I measured the front :/

I have to learn how to read. OK... I will get back to you :/

Thanks!
mromaus is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle 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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
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