I am using 285/30/20's for the rear of my 70 challenger on a 20X10 wheel, they measure 26.7 w/ 11.5" section width, 18's would have been my 2nd choice if i planned on more of a daily driver, but for a cruiser and to hit the local burger joints + carshows I figured "go big or go home" cars going on the rotisserie very shortly ill post some pics when its back on the ground with the wheel under it.
PS love the pics, the more the merrier in seeing what everyones doing to fit these big wheel/tire combos under the Ebodies >>