Another "Widest Wheel" tire thread

[tazattitude]

Sorry guys...I have to ask....

I did find these threads along with some others, but really didn't see the same setup as I have which is is pretty stock but lowered and with disc brakes

My truck and setup
1966 C-10 shortbed-fleetside
Back will be lowered 7" (I saw alot of wide tire/wheel combos, but most seemed to be on a stock height setup)
Using the stock 12 bolt rear with a disc brake setup (not the stock drum. Not for sure if this changes the wide of the rear).

Soooo, my question is the widest tire/wheel with backspacing I can go.
Is 10 or 10.5 possible wide with 4.5 backspacing possible

I did see a members truck (turquoise in color) which I believe had 10" wide wheels with 275 tires, but had to trim the flare which I wouldn't mind doing if needed. That's a WIDE flare (about 1 1/2" wide or so) on the Fleetsides.


Thanks in advance