20” wheel question

[mass_biker]

Anyone built up a 20” (i.e. ISO 451) wheel - think sizing for a Bike Friday Pocket Rocket - with a XDR driver? Or have a good online source for one or a wheelset (rim brake, BTW).

Thinking of converting my trusty BF to eTap 1x12 now that eTap has trickled down from the “Red” level - that would make for quite a nifty travel/folder.

If that is indeed the case, any suggestions on gearing choices given the smaller wheels?

Thanks
MB