Originally Posted by
katsup
..., non drive side is reverse threaded.
BB shell drive side (British /Swiss )* is left hand thread, pedal on non drive side crank is left hand thread..
Drive side crank pedal thread is right hand ..
[so tandem, crossover drive, captain's crank is RH Thread ,( no spider ) and both drive left cranks , are left hand threaded..]
* (French /Italian both sides are right hand threaded BB)