• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

Wheel backspacing range for 66 coupe

  • Thread starter Thread starter sparx
  • Start date Start date Nov 16, 2010
S

sparx

Member
Sep 2, 2009
369
1
19
Nov 16, 2010
#1
  • Nov 16, 2010
  • #1
Still searching for wheels.

When using 15" x 7" wheels the preferred backspace is 4.25".

How much of a problem is a 3.75" or 4.5" vs. the 4.25 (preferred)? (zero offset)

Tire size to be>> 215-60-15

TIA
sparx
 

dodgestang

Active Member
Dec 15, 2003
1,360
0
37
Cecil County, MD
Nov 16, 2010
#2
  • Nov 16, 2010
  • #2
sparx said:
Still searching for wheels.

When using 15" x 7" wheels the preferred backspace is 4.25".

How much of a problem is a 3.75" or 4.5" vs. the 4.25 (preferred)? (zero offset)

Tire size to be>> 215-60-15

TIA
sparx
Click to expand...

215 60 15 3.75 15x7 - rubs fender lips for most people
215 60 15 4.25 15x7 - fits for most people
215 60 15 4.50 15x7 - contacts upper control arm for everyone with stock suspension
 
S

sparx

Member
Sep 2, 2009
369
1
19
Nov 16, 2010
#3
  • Nov 16, 2010
  • #3
Thanks Dodgestang appreciate that info.
sparx
 

tx65coupe

Active Member
Nov 29, 1999
1,551
1
37
Nov 16, 2010
#4
  • Nov 16, 2010
  • #4
I'll second what he said.
 
D

danny clemens

Member
May 4, 2005
728
0
16
Nov 17, 2010
#5
  • Nov 17, 2010
  • #5
dodgestang said:
215 60 15 3.75 15x7 - rubs fender lips for most people
215 60 15 4.25 15x7 - fits for most people
215 60 15 4.50 15x7 - contacts upper control arm for everyone with stock suspension
Click to expand...

What about a 66 stock rear suspension with a 1959 9". I'm going to put the 215 60 15 4.25 15x7 on the front. Do you know the widest 60 series I can go on the rear with what backspacing? Would I be better off with a 7" or 8" wheel.

 

dodgestang

Active Member
Dec 15, 2003
1,360
0
37
Cecil County, MD
Nov 17, 2010
#6
  • Nov 17, 2010
  • #6
danny clemens said:
What about a 66 stock rear suspension with a 1959 9". I'm going to put the 215 60 15 4.25 15x7 on the front. Do you know the widest 60 series I can go on the rear with what backspacing? Would I be better off with a 7" or 8" wheel.

Click to expand...

That 9 inch is the same width as stock.
You can look here for a large listing of what has worked for different folks.
Dodgestang Photo Archives
 
D

danny clemens

Member
May 4, 2005
728
0
16
Nov 18, 2010
#7
  • Nov 18, 2010
  • #7
dodgestang said:
That 9 inch is the same width as stock.
You can look here for a large listing of what has worked for different folks.
Dodgestang Photo Archives
Click to expand...

Thanks for the link.
 

tx65coupe

Active Member
Nov 29, 1999
1,551
1
37
Nov 18, 2010
#8
  • Nov 18, 2010
  • #8
I run 235 60 15 on 15x7 Magnum 500 4.25 backspacing rear with a Versailles rear end. I think this is as big as I can go.
 
D

danny clemens

Member
May 4, 2005
728
0
16
Nov 19, 2010
#9
  • Nov 19, 2010
  • #9
tx65coupe said:
I run 235 60 15 on 15x7 Magnum 500 4.25 backspacing rear with a Versailles rear end. I think this is as big as I can go.
Click to expand...

The wheels that I'm looking at have a 4.125 backspacing. Do you think the extra 1/8" to the outside would cause your tire to rub? I know an 1/8" isn't much but sometimes small amounts can make a big difference.
 

tx65coupe

Active Member
Nov 29, 1999
1,551
1
37
Nov 22, 2010
#10
  • Nov 22, 2010
  • #10
danny clemens said:
The wheels that I'm looking at have a 4.125 backspacing. Do you think the extra 1/8" to the outside would cause your tire to rub? I know an 1/8" isn't much but sometimes small amounts can make a big difference.
Click to expand...

That would be cutting it close on my car.
 
G

Ghostly

New Member
Jul 6, 2011
3
0
1
Jul 6, 2011
#11
  • Jul 6, 2011
  • #11
Hey, Im new to the forum, but I have had a 235/60 15 on weld draglites 15x7 with 4.5 b/s for several years. The rear springs are the reverse eye type with QA1 adjustable shocks and I have had no issue with tire rubbing even with four people in the car going over bumps at speed. This was with a factory 8 in rearend and with an older style 9 in rearend.
 
6

65coupe408w

Member
Mar 26, 2010
192
0
16
Jul 6, 2011
#12
  • Jul 6, 2011
  • #12
Ghostly said:
Hey, Im new to the forum, but I have had a 235/60 15 on weld draglites 15x7 with 4.5 b/s for several years. The rear springs are the reverse eye type with QA1 adjustable shocks and I have had no issue with tire rubbing even with four people in the car going over bumps at speed. This was with a factory 8 in rearend and with an older style 9 in rearend.
Click to expand...

Hey Ghostly,

How do you like those QA1's? I am about to order up a set for my 65 but havent heard any peoples thoughts on them. Sorry for the thread hijack!
 
G

Ghostly

New Member
Jul 6, 2011
3
0
1
Jul 10, 2011
#13
  • Jul 10, 2011
  • #13
I love them, front and rear, they are only the single adjustable type but well worth the money if you want to drive hard around corners to the track and then soften them for drag racing. I dropped 4 tenths in the sixty foot by finding where the car liked the shock setting...on those 235 radial t/a's. The car was able to actually transfer the weight instead of spinning. I had competition engineering 3 way adjustables up front and ripped them into two pieces...and they were a nuisance to adjust. When i put them on the front, i had to enlarge the bolt hole on the shock towers because the shock bolts that come with the QA1's are larger. I got lucky and found them half off at a Summit scratch and dent sale...hehe
 

tx65coupe

Active Member
Nov 29, 1999
1,551
1
37
Jul 19, 2011
#14
  • Jul 19, 2011
  • #14
I no longer have the 235 60 15 BFG TAs. Those tires should just be considered a fair radial tire. There is nothing performance about them. They have terrible traction and handling characteristics and if the road is wet, forget it.

I have 215 60 15 on all 4 corners now. I found some Yokohama YK520 at Discount Tire. They work so much better. They corner better and the car even rides better on the highway.
 
You must log in or register to reply here.

Similar threads

Wheel backspacing
  • Brad Hanks
  • Sep 25, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
8
Views
435
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Sep 25, 2025
Brad Hanks
D
66 Coupe Progress Thread
  • DTCRAWLEY
  • Apr 19, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • 2 3
Replies
43
Views
810
1965 - 1973 Classic Mustangs -General/Talk- Jun 17, 2026
DTCRAWLEY
D
S
1966 coupe with 2005-2009 wheels
  • Stugots50
  • Jul 16, 2023
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
6
Views
16K
1965 - 1973 Classic Mustangs -General/Talk- Sep 1, 2023
Flogannerstill
F
M
Need Wheel Measurement Help Please
  • MintyFresh
  • Nov 15, 2022
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
1
Views
1K
1965 - 1973 Classic Mustangs -General/Talk- Nov 16, 2022
manicmechanic007
D
Wheel Dilemma - Legendary Wheel LW90
  • donavon_az
  • Feb 19, 2021
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
1
Views
3K
1965 - 1973 Classic Mustangs -General/Talk- Feb 22, 2021
wicked93gs
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?