Long searching for such a tire in 27 inch for our early Santana tandem.
Want gravel type with speedy road capability. Ideal tire would be a slight raised center / smooth and the balance having a file pattern. No knobbies. Big no to blackwalls.
Pass on Pasela and the Kenda 161 cross type.
( Thoughts of another road only 27" Gatorskins but defeats the goal of wanting to take the tandem in the loose stuff. With that being the primary goal, I may cave to a wheel rebuild and start fresh with a 700c. )