Schwalbe Marathon 700 x 25c Performance Line GreenGuard Tyre - BlackSchwalbe Marathon 700 x 25c Performance Line GreenGuard Tyre Black The forefather of all high quality touring tyres. The GreenGuard inlay made of highly elastic natural rubber is 3 mm thick. One third of the GreenGuard is made of recycled latex products. The "anti aging" side wall withstands the typical overloading caused by low air pressure for a much longer time before it gets ugly cracks. E Bike Ready: You can choose every Marathon for your E Bike