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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 11-23-08, 05:47 PM   #1
wearyourtruth
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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)?
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Old 11-23-08, 05:54 PM   #2
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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.






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Old 11-23-08, 07:48 PM   #3
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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
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Old 11-23-08, 07:55 PM   #4
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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....
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Old 11-23-08, 08:03 PM   #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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Old 11-24-08, 08:38 AM   #6
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ah, i didn't even think of the pedal threading! thanks
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Old 12-28-08, 05:46 AM   #7
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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.
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