Originally Posted by
rekmeyata
27" is NOT obsolete, your choices are smaller but there are still plenty of very good 27" tires on the market. Vittoria Zaffiro, Panaracer Pasela or the better Pasela TG, Schwalbe Marathon (finest touring tire on the market regardless of size!), Conti makes several models like the Gatorskin, Ultra Sport, Tour Ride, and Super Sport Plus, and Michelin World Tour.
Should add, one can still buy 27 inch TUBULAR's aka sew-ups. But good luck asking for them from a LBS.