Ferma Copertone Ultra Leggero 1.60 X 21

One piece molded design made from special high-strength nylon composite material Super light and impact resistant Includes Motion Pro aluminum LiteLoc™ rim lock nut and beveled washer Weighs only 56 grams (1.98 oz) with aluminum nut and beveled washer Unique contoured shape protects inner tube from abrasion and reduces heat Unique angled and tapered ribs locks tire securely to rim Our testing shows these rim locks are 10 to 20 percent stronger than cast aluminum rim locks and only half the weight Recommended tightening torque on nut is 10 lb/ft Patented design