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The 27.5" (650B) Bike Tire and 29" (29er) Bike Tire are most easily told apart by their overall size. On height, the 29" (29er) Bike Tire measures 740.0 mm against the 27.5" (650B) Bike Tire's 700.0 mm — about 40.0 mm more. On width, the 29" (29er) Bike Tire measures 740.0 mm against the 27.5" (650B) Bike Tire's 700.0 mm — about 40.0 mm more. They match almost exactly in thickness, at 55.0 mm.
The 29" (29er) Bike Tire is the heavier of the two at 900 g, compared with 800 g for the 27.5" (650B) Bike Tire. That is a 100 g difference (13%). The weight gap is modest and rarely the headline difference between them.
| Metric | 27.5" (650B) Bike Tire | 29" (29er) Bike Tire | Diff |
|---|---|---|---|
| Width | 700.0 mm | 740.0 mm | -40.0 mm |
| Height | 700.0 mm | 740.0 mm | -40.0 mm |
| Depth | 55.0 mm | 55.0 mm | 0.0 mm |
| Weight | 800 g | 900 g | -100.0 mm |