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Yep! I’m just getting my head round it all.
With a 30mm rim + Maguras required brake-surface of 29 each side, 90mm is about right.
I was thinking about 27.5 but I reckon I’m going to stick with 26r, we have three other 26r bikes in the household so tyres & tubes can be shared more easily.
Finally settling on hacking the bosses off, and putting V-brake/magura level ones on. Phew what a headfuck.
Skülly
platypus
Right; as an Instant Google Expert it looks like 90mm spacing was MTB U-brake specific.
(Despite the faff it looks like an awesome biek - Dave Yates + Tandem = much jealous!)