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Here we have some rims off of two of CDC's Dynacorn-based '67s. One is 15x7 with a P215/65R15 tire; the other has P245/40R18 rubber on an 18x8 wheel. Both are of roughly the same overall height and demonstrate the concept of plus sizing, but notice also that the wheel mounting pad is notably more outboard on the 18-inch combo, meaning its offset is more positive than that of the 15-incher. In this case, the offset difference required had to do with differing track widths and brake packages between the two vehicles.