Originally Posted by
superunleaded
... do tandem tires have to be tandem specific tires when going down to a 23mm or 25mm?
To the best of my knowledge, there's no such thing as a high-performance, narrow, tandem-specific tire.
Those of us who run skinny (23mm - 25mm) tire on our road tandems simply use -- in most cases -- the same brand/model of tire we use on our single road bikes, e.g, Michelin Pros, Continental GP's, Ultras and Gatorskins, etc...
Personally, our very nice roads here in Georgia have allowed us to use Vredestein Fortezzas exclusively for the past decade or so, in both 23mm and 25mm varieties and with no ill effect aside from fairly rapid tread wear.