Here is our latest 2015 Dragonfly frame build hot off production:
Size Med/Sm Dragonfly with couplers, thru-axle, 1cm headtube extension, brake hose clips for travel/packing, +1 bottle cage on the bottom tube. Per the photo... yeap, 9.77lbs totally nude except for a few painted decals + the Ti head badge.
With more people opting for higher power disc brakes (Shimano hydraulics for example), Calfee is now adding a brace on the rear disc side to all their tandems. They have done this for quite a while on their mtn frames, now it is also on the road setups. If you are going with rim brakes or a lightweight disc (ie TRP Spyer or Avid BB7) then you could probably still ask for no extra brace for the lightest possible setup. I opted to keep the rear rim brake bridge for the dual purpose of maybe running rim brakes (maybe for a race setup) and also for a "touring mode" pannier rack mount point (at brake bridge & threaded frame eyelets). Our default brake config will be using the Shimano R785 Di2 hydro disc levers and calipers. Our 2016 tour destination looks to be in those gentle hills known as the Pyrenees.
Fork is a Whisky No.9 road disc 49mm rake.
Here's a sibling side-by-side (err, over under). Interestingly, the new Dragonfly stoker top tube couplers are spaced approx 5/8" further apart than the 2013 Tetra. Not sure why, but ok...
More on this as I get myself organized to build it up. Heading out to single bike races in Wenachee this weekend.