• 700c to 650c wheel diameter. 17 arkose. 700c wheels fitted with 40c clement MSO tires are 2205.40 mm in diameter. A 50c 650b tire being the largest tire i can fit in the back of this frame would be 2148.85 mm in diameter meaning that id lose close to 2"s of wheel diameter and as a result the same in BB height. That much drop means some serious potential for stikes which id rather not even deal with, especially off road.

    Given this drop why is it suggested to go with 650b?

  • 700c = 622 mm diameter
    650b = 584 mm diameter

    700c x 40c = 702 mm diameter (622 + 40 + 40)
    650b x 50c = 684 mm diameter (584 + 50 + 50)

    Difference is 18 mm, which means your bb will be 9 mm lower. Around 1/3 of an inch.

  • This is pretty rudimentary and isn't always the most accurate (e.g Donnelly X'Plor MSO 650x50 measures up at a shade over 690mm dia.)

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