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Tandem BB orientation...... Peugeot TH8

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Tandem BB orientation...... Peugeot TH8

Old 08-27-22, 09:50 AM
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Tandem BB orientation...... Peugeot TH8

The stoker bottom bracket on the '80 Peugeot TH8 I'm rehabbing is oriented with the fixed cup on the NDS (left) and the adjustable cup on the drive side (right), under the triple chainrings (the captain BB is oriented fixed on left- which is the drive- and adjustable on the right). Is this the right orientation, specifically with the stoker? Seems the adjustable cup ought to be on the NDS... The captain BB is a Stronglight and the stoker is Nervar, which kinda seems unlikely that they would've have originally both been Stronglight, so maybe the stoker BB got changed... I left the fixed cups in while doing the rehab, but if the stoker ought to be the other way around I'd just as soon flip it now (assuming I can get the fixed out......).
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Old 08-27-22, 10:03 AM
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My TH8, which has TA cranks, has the fixed cup on the left, adjustable on the right for both bottom brackets.
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Old 08-27-22, 10:44 AM
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Originally Posted by Pompiere
My TH8, which has TA cranks, has the fixed cup on the left, adjustable on the right for both bottom brackets.
Many thanks, Pompiere!
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Old 08-27-22, 02:13 PM
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Probably French thread, so you can install it either way.
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Old 08-27-22, 03:33 PM
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I suppose with chain ring(s) on both sides of the stoker crank (& it being French-threaded) it doesn’t really matter- access to the cup & lockring is kind of a PITA either way with the crank arms on.
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Old 08-27-22, 05:18 PM
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A consideration not yet expressed is that, as (at least some of) the bb parts are not from the same manufacturer, timing chainline may have required a non-standard arrangement of cups and axle orientation.

And if it isn't currently broken....
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