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The AA Battery 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 AA Battery's 50.5 mm — about 649.5 mm more. On width, the 27.5" (650B) Bike Tire measures 700.0 mm against the AA Battery's 14.5 mm — about 685.5 mm more. On thickness, the 27.5" (650B) Bike Tire measures 55.0 mm against the AA Battery's 14.5 mm — about 40.5 mm more.
The 27.5" (650B) Bike Tire is the heavier of the two at 800 g, compared with 23 g for the AA Battery. That is a 777 g difference (3,378%). The weight gap is modest and rarely the headline difference between them.
| Metric | AA Battery | 27.5" (650B) Bike Tire | Diff |
|---|---|---|---|
| Width | 14.5 mm | 700.0 mm | -685.5 mm |
| Height | 50.5 mm | 700.0 mm | -649.5 mm |
| Depth | 14.5 mm | 55.0 mm | -40.5 mm |
| Weight | 23 g | 800 g | -777.0 mm |