I’m with TJ on all of the above; after many years of tandem rides for bad weather commutes, café days and especially touring, our Dawes Double Edge has settled into a fast and fun set up:
Rigid fork; wide, strong bars and chunky stem. Hope M4 front for control, BB7 rear for emergency heat handling, both 200mm. Thudbuster post on the back. 3×10 to get the extensive gear range and yes, it’s very slow up 20% climbs like the Lecht. And stupendously fast down the other side. Wheels are 650b, 36h on Hope. These fit in the 26″ frame just fine with tyres around 38mm, even with mudguards on.
Fastest trailer descent was well over 85kph and we’ve never had an issue with boiling that front brake. We also do what TJ describes, braking in sharper bursts and communicating this to the stoker, so she doesn’t get a fright. See Rule 1.
A tandem copes mush better with a wet, windy day than a conventional bike, plus the Mrs gets a better view of the world when not having to watch out for hazards