Jan Heine posted-
So a single-bike fork (non-OS headset) on a tandem
> should be viewed with suspicion.
I agree that a fork built for single bike used on a tandem is not wise but steerer diameter is not the only criteria to determine the fork's suitability for tandem use. One inch steerers have been successfully used for a long time but extra thick tubes are needed. Within CR timelines, Santana built hundreds of tandems with 1" steerers without problems. With that said, if I was to start building tandems again an oversized steerer (28.6mm) makes sense now because 1" tandem specific steerers aren't readily available.
Curt Goodrich
Minneapolis, MN