The new Flat-less tire HS440. After 10 years, Schwalbe have thoroughlyoverhauled the Marathon Plus. The only true flat-less tire gets a new, dynamic profile and boasts many internal improvements: Rolling resistance. The patented, 5 mm thick SmartGuard layer, when compared to all generic products, has a significant advantage in rolling resistance. We further extended its lead in the latest version. Recycling. Also in the SmartGuard, we now use a proportion of recycled rubber from old latex products. "Anti-aging" side wall. It now lasts much longer before deveolping unsightly cracks when subjected to use with too low air pressure. E-Bike ready. The main sizes are approved and tested for E-bikes up to 50 km/h. Following sizes carry the ECE-R75 mark: 47-406, 47-559, 37-622, 40-622, 47-622. Compare All Schwalbe Touring Tires Features Specifications What do size markings on bicycle tires mean? Art. # ETRTO Size Technology Color Compound PSI Weight EPI Load Tube 11100756 35-349 16 x 1.35 SmartGuard Black-Reflex Endurance 65-110 16.9oz (480g) 67 143lb (65kg) 4 11100757 35-406 20 x 1.35 SmartGuard Black-Reflex Endurance 65-100 19.8oz (560g) 67 154lb (70kg) 6 11100758 47-406 20 x 1.75 SmartGuard Black-Reflex Endurance 50-70 25.6oz (725g) 67 176lb (80kg) 7 11100759 47-507 24 x 1.75 SmartGuard Black-Reflex Endurance 45-70 32.4oz (920g) 67 209lb (95kg) 10 11100760 35-559 26 x 1.35 SmartGuard Black-Reflex Endurance 65-100 27.3oz (775g) 67 187lb (85kg) 12A 11100761 40-559 26 x 1.50 SmartGuard Black-Reflex Endurance 55-95 30.1oz (870g) 67 220lb (100kg) 12A,13 11100762 47-559 26 x 1.75 SmartGuard Black-Reflex Endurance 45-70 25.1oz (995g) 67 240lb (109kg) 13,14 11100763 50-559 26 x 2.00 SmartGuard Black-Reflex Endurance 30-70 38.8oz (1100g) 67 260lb (118kg) 13,14 11100764 37-590 650 x 35A SmartGuard Black-Reflex Endurance 55-85 30oz (850g) 67 198lb (90kg) 12 11100765 42-590 650 x 40A SmartGuard Black-Reflex Endurance 50-85