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Mavic made an adapter to use 700C in 26" frames, basically a brake arch with extra studs at the right height. Something similar wouldn't be hard to design to take road brakes, in fact I may even have something in the CAD files, but it would be pricey and Dolan frames aren't. Do Conti still make 26x1 Supersonics? That would be pretty sporty without having to mess about, and smaller wheels are inherently stiffer, so you can cut the spoke count for the aeros
So we've got access to a touring tandem, and any future tandem purchase dreaming has been oriented towards a more racey option.
I've been offered this frameset and a few bits for free (well, postage) - it should be possible to get it to fit me and the back looks good for the stoker. Problem is it's 26" - worth trying to bodge it to 700c or a non-starter?