Tires Cycling, Outdoor Recreation, Schwalbe, Sports & Outdoors, Tires & Tubes Schwalbe Silento HS 421 City/Touring Bicycle Tire – Wire Bead Review by Coyotea October 5, 2018 No Comments SBC compound Reflex 35-65 PSI 625g – 26 x 1.75 EPI 50 Lighter, quieter running on asphalt with enough grip for off-road excursions. KevlarGuard protection and 50 EPI carcass made for a nice well rounded package.