What??? Only 2 wheels?
Join Date: Apr 2010
Location: Boston-ish, MA
Bikes: '73 Raleigh Carlton Gran Sport, '72 Peugeot UO-8, '82 Peugeot TH8, '87 Bianchi Brava, '76? Masi Grand Criterium, '87 Centurion Ironman Expert, '74 Motobecane Champion Team, '86 Gazelle champion mondial, '81? Grandis, and lots of uncertainty on some
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I would expect the Mechanics forum to suggest most of the likely causes. You should start by checking all the things that could have loosened up, the crank arm bolts, the chainring bolts, the bottom bracket bearings, the pedal bearings, etc. For tandem-specific things, check that your timing chain isn't too loose, that it's alignment is okay, that neither timing gear is warped. Finally, it is possible that the problem is in the stoker's BB even though the thump seems to be coming from the captain's. So check all the obvious stuff back there too. Even check that the front derailleur isn't being hit by a crank arm.
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