Yes, the idea of keeping the bent's was that we were going to buy a "bent tandem". We finally had to realize that we couldn't "afford" a bent tandem any time in the near future. We bought the Trek T-900 conventional tandem, (very afforadble) and I found that my knees/ankles and my wife found her hip bones, DID NOT like going from DF pedaling style to BENT peddaling style and back! So we decided to sell the "commuter/utility" bents and buy "fitness" style DF's. It not only stopped the "pains" we were having, it also gives us more, "SEAT" time so we can more easily get more "miles" per day, comfortably on the tandem. I know many folks, can ride both types of bikes "back to back" and not have any pain problems, for some reason, it wasn't working for us??