Okay, I'm thinking about building up our C'dale with 630 rims/wheels (27").
The only "tandem" rated rim I can find in 27", currently being manufactured, is the Velocity Dyad.
Now the Dyad is a fine rim, but by no means is it a tandem rated rim in my book. The Velocity Chukker is a much better tandem rim and the Velocity Psycho trumps even the legendary Mavic Module 4. However, the Velocity Chukker and Velocity Psycho are both only available in 622 (700c).
Does anyone have a secret stash of something truly bombproof like old Mavic tandem rated rims? I don't know if the Mavic T519 or T520 or even the Mavic A719 or A720 ever came in 630. However, if they didn't I'd still be interested in Mavic Module 3 or Mavic Module 4 rims or something similar and bombproof in 630 (27").
Thanks for reading. Post if you know a source, PM if you are the source.