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  1. #1
    Ride for Life wearyourtruth's Avatar
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    tandem crank question

    i've been shopping the internet for a new set of cranks for my road bike and i keep coming across "tandem cranks." i understand how a tandem works, but is there any difference between a tandem crank and a regular double crank, other than the chainring(s)?
    before posting, a "noob" should always ask themselves "could this have been answered by first visiting Sheldon Brown

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  2. #2
    hors category TandemGeek's Avatar
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    A tandem's crossover crankset's left-hand cranks will have crank spiders for the timing rings / sync chain that transmit the captain's power from the front crankset to the rear crankset along the tandem's left side. The right front crank has no spider... just as the left-hand crank does on a single bike.





    Last edited by TandemGeek; 11-23-08 at 06:01 PM.

  3. #3
    Ride for Life wearyourtruth's Avatar
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    yeah, but the front cranks look identical to road cranks, they are just flipped, eh? i mean there really is no "left" or "right" crank, only drive and non-drive side
    before posting, a "noob" should always ask themselves "could this have been answered by first visiting Sheldon Brown

    -Tim-
    www.velocipedebikeproject.org

  4. #4
    hors category TandemGeek's Avatar
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    Quote Originally Posted by wearyourtruth View Post
    yeah, but the front cranks look identical to road cranks, they are just flipped, eh? i mean there really is no "left" or "right" crank, only drive and non-drive side
    If you ignore the pedal threading being reversed, then yes....

  5. #5
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    Converted single bike cranks used on a tandem require applying loctite to the pedal threads, or installing a helicoil to change the threading on 3 of the crankarms. So, if you want to use a captains crank you will need to do that.

    If you use a stoker crankset, you will not need to change anything, but you may wish to remove the timing ring.
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  6. #6
    Ride for Life wearyourtruth's Avatar
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    ah, i didn't even think of the pedal threading! thanks
    before posting, a "noob" should always ask themselves "could this have been answered by first visiting Sheldon Brown

    -Tim-
    www.velocipedebikeproject.org

  7. #7
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    Quote Originally Posted by wearyourtruth View Post
    ah, i didn't even think of the pedal threading! thanks
    An engineer whom I trust suggests 'countertapping' the existing threading. This way you have two threadings in one crank - both left-hand and right-hand. Mount the pedal with some Loctite and you're ready. The thickness of a crank (very roughly 1 cm) gives a secure hold.
    Regards, Marten / www.tandemclub.nl
    '03 Santos Dual Travel | '13 MSC Zion Tandem

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