• Do I need a new calculator?

    26" = 559mm rim diameter.
    2.4" = 61mm tyres
    61+61+559=681mm
    650b = 584mm rim diameter
    47+47+584=678mm

    Still very close, but 685mm?

  • There are different ways to calculate it. Some people assume a circular tyre profile, others don't, etc.

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