Offset question

[PlmCzy70]

does any one know what the offset was on the factory Chrysler Ralleye wheels. I’m going with 275’s on the rear so I think right around 0 mm would be best. I see a lot of the cars on the site have the rally wheels so if you do, what’s the offset on yours?. my car has no mods at all.

 

[pschlosser]

5.5-inches seems to come to mind as the standard offset for most E and B body wheels of this era.

 

[PlmCzy70]

5.5-inches seems to come to mind as the standard offset for most E and B body wheels of this era.

I’m assuming you mean backspace when you say 5.5 inches

 

[Challenger RTA]

15'' x 7''

Specifications:​

Part Type
Wheel
Product Line
Wheel Vintiques Chrysler Rallye Wheels
Back Spacing
4.25 in (107.95 mm)
Center Cap Included
No
Hub Centric
No
Lug Nut Seat Style
Conical seat - 60 degree
Package Depth
17.70
Package Height
8.30
Package Width
17.00
Part Category
Replacement Parts
Part Fitment
Universal
Primary Wheel Color
Silver
Quantity
Sold individually
Shipping Weight
26.70
Valve Stems Included
No
Vendor Part Number
56-5712044
Wheel Bolt Pattern
5 x 4 1/2 (114.3 mm)
Wheel Construction
2-piece
Wheel Diameter
15 in (381 mm)
Wheel Finish
Gloss Black
Wheel Material
Steel
Wheel Offset
6 mm (.2362 in)
Wheel Type
Car Street Wheels
Wheel Width
7 in (177.8 mm)

 

[Challenger RTA]

Specifications:​

Part Type
Wheel
Product Line
Wheel Vintiques Chrysler Rallye Wheels
Back Spacing
4.5 in (114.3 mm)
Center Cap Included
No
Hub Centric
No
Lug Nut Seat Style
Conical seat - 60 degree
Package Depth
9.50
Package Height
17.70
Package Width
16.50
Part Category
Replacement Parts
Part Fitment
Universal
Primary Wheel Color
Silver
Quantity
Sold individually
Shipping Weight
28.10
Valve Stems Included
No
Vendor Part Number
56-5812042
Wheel Bolt Pattern
5 x 4 1/2 (114.3 mm)
Wheel Construction
2-piece
Wheel Diameter
15 in (381 mm)
Wheel Finish
Gloss Black
Wheel Material
Steel
Wheel Offset
0 mm (0 in)
Wheel Type
Car Street Wheels
Wheel Width
8 in (203.2 mm)

 

[pschlosser]

I’m assuming you mean backspace when you say 5.5 inches

I do and did. It was the only "offset" I could think of, the back-space. But Challenger RTA's data (posts #4 #5) suggests its 4.5-inches.

 

[MILOJ]

Maybe that was lug spacing

 

[HPP]

According to Challenger RTA's post above the 15x7 has 4.25" backspace with 6mm offset. I think this is a factory spec, but I’m not sure. 6.5” may have been the original width. The 15x8 has 4.5" backspace with 0 offset. This is an aftermarket spec that was never available from the factory but many owners now prefer this for the wider look it provides. No factory wheel from the era had 5.5" of backspace on it.

Backspace and offset chart for most standard wheels below.

 

[cuda426]

does any one know what the offset was on the factory Chrysler Ralleye wheels. I’m going with 275’s on the rear so I think right around 0 mm would be best. I see a lot of the cars on the site have the rally wheels so if you do, what’s the offset on yours?. my car has no mods at all.

I have a 1973 CUDA and the factory wheels had a 4.5" offset. I had to order American Racing wheels with a 5" offset to mount 255's on the rear as the passenger's side tire made slight contact with the wheel well with the original factory wheels.

 

[cuda426]

I have a 1973 CUDA and the factory 15 x 8 wheels had a 4.5" backspace. I had to order American Racing wheels with a 5" offset to mount 255's on the rear as the passenger's side tire made slight contact with the wheel well with the original factory wheel

 

[moparleo]

There was never a factory 8" Rallye wheel made.
It will need to be custom and will not likely fit without rolling the fender lips.
Still a 275mm section width tire may still rub cornering on the leaf springs or inner fenders if you are looking to use them at stock height.
No air shocks ! New springs with a little more arch.

 

[6PKRTSE]

There was never a factory 8" Rallye wheel made.
It will need to be custom and will not likely fit without rolling the fender lips.
Still a 275mm section width tire may still rub cornering on the leaf springs or inner fenders if you are looking to use them at stock height.
No air shocks ! New springs with a little more arch.

I run 15"x8" Rallye's on the rear of my Challengers with a 4-1/2" back space and 295 rear tires with no modifications and all stock factory suspension. It is close but nothing rubs anywhere.

 

[cuda426]

does any one know what the offset was on the factory Chrysler Ralleye wheels. I’m going with 275’s on the rear so I think right around 0 mm would be best. I see a lot of the cars on the site have the rally wheels so if you do, what’s the offset on yours?. my car has no mods at all.

does any one know what the offset was on the factory Chrysler Ralleye wheels. I’m going with 275’s on the rear so I think right around 0 mm would be best. I see a lot of the cars on the site have the rally wheels so if you do, what’s the offset on yours?. my car has no mods at all.

does any one know what the offset was on the factory Chrysler Ralleye wheels. I’m going with 275’s on the rear so I think right around 0 mm would be best. I see a lot of the cars on the site have the rally wheels so if you do, what’s the offset on yours?. my car has no mods at all.

My

I run 15"x8" Rallye's on the rear of my Challengers with a 4-1/2" back space and 295 rear tires with no modifications and all stock factory suspension. It is close but nothing rubs anywhere.

View attachment 147526

View attachment 147527

View attachment 147528

View attachment 147529

does any one know what the offset was on the factory Chrysler Ralleye wheels. I’m going with 275’s on the rear so I think right around 0 mm would be best. I see a lot of the cars on the site have the rally wheels so if you do, what’s the offset on yours?. my car has no mods at all.

My springs in the rear don't quite have the arch required to run 275s I run 255's with a 5" backspace.

 

[PlmCzy70]

There was never a factory 8" Rallye wheel made.
It will need to be custom and will not likely fit without rolling the fender lips.
Still a 275mm section width tire may still rub cornering on the leaf springs or inner fenders if you are looking to use them at stock height.
No air shocks ! New springs with a little more arch.

I’m running a 245 now in a 14 inch wheel so go into a 275 is basically a little over an inch wider. My Crager mags are the reverse mags with probably about 50 mm negative offset they do not rub in the back so I think I’d be safe with a zero offset With a 275 wheel. I can only hope. but going to a zero offset will really move that tire in away from the wheel well opening towards the leaf spring of which I have lots of room