Schwalbe Marathon Original tyre offers level 5 GreenGuard puncture protection and is also suitable for E-Bikes. 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. TheAnti-Agingsidewall can withstand the typical cracking that results from overloading due to insufficient inflation pressure for much longer.Key Features:Wired tyreEndurance CompoundReflective side wallTwinSkin sidewallE-bike use for speeds up to 25/50kph (depending on the model)Weight: 520gPlease Note: The 26x1.25 is 32-559 and will fit a standard 26" wheel with no issuesThe 26x1 3/8 is 37-590 which is a Schwinn tire size that is specific to them. It will not fit a regular 26" wheel.