We put the WoundUp Duo2 on our 04 Cdale road tandem and love it. It is 1-1/8, straight tube, disk, and QR. We also looked at the Whisky Fork No. 7 CX Disk Straight. The Whisky isn't tandem rated but it is listed as having no weight limit. It is also $100-$200 cheaper than the WoundUp (depending on options for the WoundUp, the No 7 has fender mounts standard). In correspondence with Whisky, they said tandem use would void any warranty.
I would suggest getting the DT Swiss RWS skewer to use with a QR disk. It has a greater clamping force over a standard cam QR and it is easy to eliminate rotor rub with the RWS when reinstalling the wheel.
Last edited by New2Two; 06-14-19 at 08:18 AM.