If you want to take your Calfee with you on a trip, the ti couplers are the only way to fly. Calfee only does the couplers on the Tetra Tandem or single. In fact, most of the Calfee tandems we sell have couplers. My wife has a single tetra with couplers. The only downside is the little bit of wieght added by the couplers. The upside is having a real bike that you can take with you and not deal with the hassles of oversize luggage. The couplers are invisible while riding the bike. If you ride a bike with couplers and one without, you won't be able to tell the difference. We have pictures in the Calfee section of our website. Patrick Gibbons