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@M_V
^That.
Done because it is/was thought to create a stiffer wheel but actually doesn't make any difference. Common on (track) tandems.
These tandem training wheels are quite interesting actually, a wide (I'm presuming 130 or 135mm) spaced rear hub, flip flop double fixed. It was unbranded, looked like it could be small batch custom. The rear I looked at last night was 48 spoke and the rim was a Mavic one that looked very much like it was from a wheelset, like it said Aksium, or Ksyrium or something on it. I wondered if was a 24h rim that'd been drilled between each spoke hole to make it into a 48h but all the holes were eyeletted and the eyelets all appeared the same and factory.
Edit: Hadn't realised the front rim was so visible in the shot I posted tonight. Rear rim on the other tandem is also a Ksyrium SL but was definitely 48h.