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    Effect of wheel size on speedo readout?

    I recently laced a 250w Yose motor into my Pashley. Vintage rod brakes and Westwood rim wheel, and it is a 26 x 1 ⅜ inch quite a bigger wheel than a 26 mountain bike wheel say 26 x 1.75. The display is a Yose Power Y02 and reads "26 inch" on the display. This will be an incorrect speed...