Join Date: Feb 2005
Location: Buckhorn, Ontario, Canada
Bikes: Rans Screamer, Catrike Expedition, Specialized Montain Bike, Cannondale Quick SL1
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You guessed correctly! IP is in phase with both cranks at 12 o'clcok at the same time in the rotation, and OOP is out of phase with one set of cranks 90 degrees forward, usually the captain's, from the other set of cranks. Sorry about the confusion, but I really thought someone on the bent forum might also be a tandem rider. I've posted the same question on the tandem forum, where the topic is discussed frequently, but only as it applies to DF (diamond frames) bikes. Regret that I do not have a picture that would make my query any clearer.