Help me with offset and slicks sizing...please?

[Supe]

The tires on there measure EXACTLY what my slicks do. No wheel well mods at all, only a rolled lip. 28x10.5 on a 8 inch rim.

Here is after the frame notch with the spacer removed.

 

[454mali]

68-72 12 bolt axles are 1 5/8 longer each. I'd say the max is 5.5 with no rubbing. I have 4.25 bs with a stock width rear and it rubs but not bad. with 3/8's more frame to tire clearance it should work out perfectly. Someone correct me if I am wrong. i havent cut up my z-28 wheels yet to widen them so I havent actualy had this backspacing on my car to make sure.

 

[GreenDragginBu]

dang forgive me guys i didnt even catch it was a 12 bolt a-body rear.....i had one in mine last summer 15x8 1/2 with 5" b.s.

 

[riceca]

Well as far as I can tell it is either 4.5" backspace or 5.5" backspace.

Here is some info I got from Summit.

Description
1. Wheel, Draglite, Aluminum, Polished, 15 in. x 8 in., 5 x 4.5/ 4.75 in. Bolt Circle, 4.5 in. Backspace, Offset (mm) 0.00mm


2. Wheel, Draglite, Aluminum, Polished, 15 in. x 8 in., 5 x 4.5/ 4.75 in. Bolt Circle, 5.5 in. Backspace, Offset (mm) +25.00mm

What is with the offset numbers? I am not up to par on all the numbers. thanks again
CHRIS

 

[malijuice]

12 bolt

i have a 64-67 chevelle 12-bolt it was 53 5/8" housing end to housing end i have a full frame notch mini tubbed 29.5x10.5 15x10 5.5 backspace,if u have the 68-72 rear and want to run a 10" rim 6.5 backspace will work.