Hello Jeff. I just purchased a Rover Tandem, and added a Patterson crank up front for higher gearing. I did NOT get IPS. I thought the Patterson would change the gearing for both front and rear peddlers, but it only affects the front captain. So the captain peddles at a slower cadence compared to the rear stoker when the Patterson is engaged. In fact, the back stoker cadence becomes too fast if I engage the Patterson up front. Is there a remedy for this? Thanks. Ken- new rover tandem owner, new to TerraTrike.