27.5" (650B) Bike Tire vs 275/65R18 Tire: Size & Dimensions

The 27.5" (650B) Bike 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 27.5" (650B) Bike Tire's 700.0 mm — about 115.0 mm more. On width, the 275/65R18 Tire measures 815.0 mm against the 27.5" (650B) Bike Tire's 700.0 mm — about 115.0 mm more. On thickness, the 275/65R18 Tire measures 275.0 mm against the 27.5" (650B) Bike Tire's 55.0 mm — about 220.0 mm more.

The 275/65R18 Tire is the heavier of the two at 23.00 kg, compared with 800 g for the 27.5" (650B) Bike Tire. That is a 22.20 kg difference (2,775%). The weight gap is modest and rarely the headline difference between them.