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15" cop car wheel specs
https://slantsix.org/forum/viewtopic.php?t=33472		 Page 1 of 1
Author:  Jopapa [ Sat Jan 24, 2009 2:21 am ]
Post subject:  15" cop car wheel specs
Anyone know the specs off the top of their head? I want to make sure I don't end up with wheels that came off a drum/drum car and then find out the hard way when I go to install them on the 11.75" rotors when my brakes are done...
Author:  Joshie225 [ Sat Jan 24, 2009 8:31 am ]
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The later cop car wheels have 6 oval slots, measure 15x7" and have 4 1/4" backspacing or +6mm offset. Older cop cars often had drum brakes.

Image
Author:  Eric W [ Sat Jan 24, 2009 9:14 am ]
Post subject: 
Drum brakes in the rear, yes. By the late '70's (1978?) when the police rims came out front disk brakes where standard.
Author:  Joshie225 [ Sat Jan 24, 2009 10:16 am ]
Post subject: 
You never can tell what some people will come up with. I was just trying to warn him off off wheels from a late 60's, early '70s police car with 11x3" drums or something similar. If he finds the wheels pictured they will fit just fine.
Author:  Eric W [ Sat Jan 24, 2009 10:26 am ]
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I hear ya. They will still work with front drum brake cars...I've still got the 10X2.5" finned front drums and have no issues with my cop rims.
Author:  Joshie225 [ Sat Jan 24, 2009 10:48 am ]
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Yep, disc brake wheels will fit drum brakes fine, but not the reverse.
Author:  kesteb [ Sun Jan 25, 2009 10:08 pm ]
Post subject: 
You can find 15x7" rims on Cordobas. They are not the "cop car" rims and they match the standard style steel rims. Cordobas also came with 15x6.5" rims. 15x6" rims can be found on late 70's mopars. The 15x5.5" rims can be found on early '70s mopars. Any 15" rim after 1972 should work just fine with disk brakes.
Author:  Jopapa [ Mon Jan 26, 2009 8:11 pm ]
Post subject: 
Quote:
You can find 15x7" rims on Cordobas. They are not the "cop car" rims and they match the standard style steel rims. Cordobas also came with 15x6.5" rims. 15x6" rims can be found on late 70's mopars. The 15x5.5" rims can be found on early '70s mopars. Any 15" rim after 1972 should work just fine with disk brakes.
You know the backspacing for the Cordoba rims off the top of your head? I found a set of Cragar 15x7 rims on Summit that I like for a temporary wheel to use until the suspension is done and I can afford the 17" rims I want, but these 15s have a 3.75" backspacing so I'll have to measure to make sure they don't stick out too far.
Author:  Joshie225 [ Mon Jan 26, 2009 8:22 pm ]
Post subject: 
A 7" wide wheel needs to have 4 1/4" backspacing to fit an A-body correctly. A 6" wide wheel can be 3 3/4" backspacing. Both are 1/4" positive offset.

To determine offset from backspacing take the wheel width (which is measured on the inside where the tire bead seats) add 1" for the inner and outer rim portion (a 7" wheel is 8" to the outside). Divide by 2 to find the zero offset backspacing which is 4" for our 7" wide wheel. The backspace measurement difference from 4" is the offset. That is of the backspace is 4.25" or 3.75" the offset is 1/4". If the backspacing is greater than 4" you have + (positive) offset wheels and if it's less you have - offset wheels.

You'll find that most vintage wheels do NOT have enough backspacing for an A-body and stick out too far. Original 15x7" Chrysler wheels fit best as they are 1/4" positive offset and have the correct center bore. Cordoba wheels will fit fine as long as they are still the original Chrysler equipment.
Author:  Jopapa [ Mon Jan 26, 2009 8:39 pm ]
Post subject: 
Quote:
A 7" wide wheel needs to have 4 1/4" backspacing to fit an A-body correctly. A 6" wide wheel can be 3 3/4" backspacing. Both are 1/4" positive offset.

To determine offset from backspacing take the wheel width (which is measured on the inside where the tire bead seats) add 1" for the inner and outer rim portion (a 7" wheel is 8" to the outside). Divide by 2 to find the zero offset backspacing which is 4" for our 7" wide wheel. The backspace measurement difference from 4" is the offset. That is of the backspace is 4.25" or 3.75" the offset is 1/4". If the backspacing is greater than 4" you have + (positive) offset wheels and if it's less you have - offset wheels.

You'll find that most vintage wheels do NOT have enough backspacing for an A-body and stick out too far. Original 15x7" Chrysler wheels fit best as they are 1/4" positive offset and have the correct center bore. Cordoba wheels will fit fine as long as they are still the original Chrysler equipment.
Good to know. I'll have to keep my eyes open to see if I can find a set of wheels that'll fit then. I'd like to find some brand new wheels though, since then I'll know they haven't been damaged and aren't out of round at all.
Author:  Jopapa [ Tue Feb 10, 2009 10:13 pm ]
Post subject: 
Wow shopping for wheels is a PITA. Seems like Summit is the only place I can shop by size. Everywhere else wants a vehicle for reference. Looks like everybody wants to be a parts-store counter croney :evil:

Soooo, anyone know a reference that uses the right size wheel?
Author:  slantvaliant [ Wed Feb 11, 2009 6:34 am ]
Post subject: 
Discount Tire lets you shop by size online. They also can get wheels not listed on the website, especially other sizes/offsets.
Author:  Wesola78 [ Tue Mar 10, 2009 3:46 pm ]
Post subject: 
If I remember correctly, 3766077 is the part number for police car wheels that were used on all Dodge and Plymouth cop cars from 1978 until 1989. The four cop car wheels on my '78 Volare are from four different years. They all look the same though.
I love those wheels with dog dish hubcaps! 8)
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