The original: The archetypal high quality touring tire. The highly elastic GreenGuard layer is 3 mm thick. One third of the GreenGuard is made up of recycled latex products. The Anti-Aging sidewall can withstand the typical cracking that results from overloading due to insufficient inflation pressure for much longer. E-Bike Ready. You can choose every Marathon for your E-Bike (E-25). The main sizes are approved and tested for E-bikes up to 50 km/h (E-50).