[國外網站]-各種不同山地自行車輪組尺寸提供給您參考

26in (26×2.3in tyre)

  • Bead Seat Diameter: 559mm
  • Outside Diameter: 677mm

27.5in (650b) (27.5×2.3in)

  • Bead seat diameter: 584mm
  • Outside diameter: 702mm

27.5in+ (650b+) (27.5x3in)

  • Bead seat diameter: 584mm
  • Outside diameter: 740mm

29in (29×2.3in)

  • Bead seat diameter: 622mm
  • Outside diameter: 740mm

29in+ (29x3in)

  • Bead seat diameter: 622mm
  • Outside diameter: 778mm

Read more at http://www.mbr.co.uk/how-to-2/tech-advice/complete-guide-to-wheelsizes-26in-650b-650b-29in-29in-327096#fAtIo7EYsw8O2xlt.99