• I am trying to avoid spending like £160 on set of Stronglight tandem cranks (two pairs). Instead I am using the old tandem set and replacing the triple RH crank (from the Dawes). Of the five chainrings (!) on the frankenset I'm replacing four, for a total of £75 or so. It's a worthwhile saving.

    FUN QUIZ TIME
    I fitted the existing synch crank (pic below, left side) and the triple RH crank below from the parts bin (pic below, right side). Who can tell me why it didn't work?

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