CAMPAGNOLO SHAMAL ULTRA USB DISC BRAKE WHEELS WITH 19.5MM CHANNEL. TWO-FIT, PRACTICALLY CLOSED, NO TAPE NEEDED, ONLY SEALANT OR AN INNER TUBE DEPENDING ON USE. I CURRENTLY USED THEM ON A GRAVEL BIKE WITH PIRELLI CINTURATO 40MM TIRES THAT ARE FAIRLY NEW. THEY ARE ALREADY SET UP TUBELESS WITH VALVES INSTALLED, OBVIOUSLY. USED PURELY ON PERIPHERAL/COUNTRY FARM ROADS; THEY CAN BE USED FOR GRAVEL SUCH AS DIRT, GRAVEL, AND CRUSHED STONE, OR FOR ROAD USE BY SIMPLY CHANGING THE TIRES. THE WEIGHT OF THE BARE WHEELS IS 1525G WITH CENTER LOCK MOUNT FOR THE DISC AND CAMPAGNOLO N3W 13S FREEHUB BODY, WHICH ...