275/55R20 Tire vs 275/65R18 Tire

The 275/55R20 Tire and 275/65R18 Tire are most easily told apart by their overall size. On height, the 275/65R18 Tire measures 815.0 mm against the 275/55R20 Tire's 811.0 mm — about 4.0 mm more. On width, the 275/65R18 Tire measures 815.0 mm against the 275/55R20 Tire's 811.0 mm — about 4.0 mm more. They match almost exactly in thickness, at 275.0 mm.

The 275/65R18 Tire is the heavier of the two at 23.00 kg, compared with 22.00 kg for the 275/55R20 Tire. That is a 1.00 kg difference (5%). The weight gap is modest and rarely the headline difference between them.