
The 26" Bike Tire and 27.5" (650B) Bike Tire are most easily told apart by their overall size. On height, the 27.5" (650B) Bike Tire measures 700.0 mm against the 26" Bike Tire's 660.0 mm — about 40.0 mm more. On width, the 27.5" (650B) Bike Tire measures 700.0 mm against the 26" Bike Tire's 660.0 mm — about 40.0 mm more. On thickness, the 27.5" (650B) Bike Tire measures 55.0 mm against the 26" Bike Tire's 50.0 mm — about 5.0 mm more.
The 27.5" (650B) Bike Tire is the heavier of the two at 800 g, compared with 700 g for the 26" Bike Tire. That is a 100 g difference (14%). The weight gap is modest and rarely the headline difference between them.
| Metric | 26" Bike Tire | 27.5" (650B) Bike Tire | Diff |
|---|---|---|---|
| Width | 660.0 mm | 700.0 mm | -40.0 mm |
| Height | 660.0 mm | 700.0 mm | -40.0 mm |
| Depth | 50.0 mm | 55.0 mm | -5.0 mm |
| Weight | 700 g | 800 g | -100.0 mm |