ECE-R75 is a certification given to tires that pass stringent safety regulations governed by the United Nations Economic Commission for Europe. Due to the increased load, torque and speed of ebikes, they are classified under the ECE as mopeds in Europe which are governed at 50 km/h and must pass more stringent guidelines than standard bicycle tires. Features: E-Bike High Mileage Compound w/Superior Grip Characteristics Knobby Tread Design For Better Traction and Handling Off Road Star Pattern in the Middle and Large Inclined Angle Provides Superb Traction with low Rolling Resistance Horizontal Blocks Ensure Excellent Braking with Minimal Slip Super-Wide Aggressive Tread Make This a Go-Anywhere Tire Specifically Formulated For High Speed & Heavy Load Applications FPS Flat Protection System Reflective Sidewall Strip Specs: Bead: Wire TPI: 60 Size/Weight: 20 x 4.0: 1100g+/- 26 x 4.0: 1495g+/- Pressure: 20 PSI Max Disclaimer: Tube Must Be Used Inside Of Tire ECE-R75 Certification