Need wheel specs for 72 C10

[1972babyblue]

I've done a lot of measuring myself, but if anyone knows the widest rim with the proper offset to stuff under my 72 C10, it may help confirm my own measuring before I spend the money for something that won't fit. I will be installing tubs, so I can go as far as the frame/trailing arms will allow. The only chassis changes is C-notching and shorter coil springs and and installing coil-over shocks. Thanks!!!!

[ratrod67]

I run a 15x10 with a 5 inch backspace and a 315/60 Drag radial with stock tubs. I use to know of a truck with the tubs cut all the way to the frame and he ran a 15x12 with 7 inch backspacing. I don't remember the size tire though. It was a M/T Sportsman.