out of curiosity would anybody out there know the size of a tire with a 28.0 o.d.? i know its a weird question but any help will be cool. also would a 255 70 15 tire fit without modifications to stock rear wheel well? wanna find out before i buy the tires
using 15 x 8 chevy rallyes

275/60/15 is 28" tall. I assume these are on a 68 if so than you would need a 15x8 wheel with 4.5" b.s to fit the 275/60/15 on the back without rubbing. The 255/60/15 are 27" tall and could run either 3.5" or 4.5" b.s.