Re: 275/60/15 and convo pros
I have Autodrags on my '69 with 275 60 15 BFG Drag Radials. They are 15x8.5" with 4 7/8 backspacing. I have de-arched Eaton 4 leaf Z28 springs in the back and the top of the tire tucks by about 2" or so.
And that is the absolute biggest tire that will fit IME. Depending on your quarter panels, you may or may not be able to move the tire out without rolling or trimming the lip. The 5" would rub for sure on my car, and when I turn sharp the tires rub the inner-wheel wells.
44 Willys MB
64 Corvette Coupe
68 Camaro 'vert LT1 & T56 (project)
69 Z/28 clone 355 12.6's @110
72 Jimmy 4WD 4spd 4" & 35's
72 240Z-2.9l L6, triple Del'Lortos, T5, 12mm R200 LSD
85 FJ1100 & 01 XR400
02 GMC 2500HD 4x4 Duramax