Joined: Dec 2019
Posts: 2,841
Likes: 1,062
From: South Shore of Long Island
Bikes: 2010 Carrera Volans, 2015 C-Dale Trail 2sl, 2017 Raleigh Rush Hour, 2017 Blue Proseccio, 1992 Giant Perigee, 80s Gitane Rallye Tandem
My burley rock and roll tandem had a similar BB shell that I feel was close in dimension to what you have. It was a pair of pressed in cartridge bearings with a separate square taper spindle. The issue there would be finding the replacement spindle, the bearings were a standard size but obviously the spindle wasn't. Was my main reason for getting rid of it.