Schwalbe Marathon HS 420The Original. The forefather of all high-quality touring tyres. The Green- Guard insert made of highly elastic natural rubber is 3mm thick. One third of the GreenGuard is made from recycled latex products. The anti-aging sidewall endures the typical overloads caused by too low air pressure for a significantly longer time before it gets ugly cracks. E-Bike Ready. You can use all Marathon models on your E-Bike (E-25). The most important sizes are tested and approved for E-bikes up to 50 km/h (E-50).