Schwalbe Marathon Plus Wheelchair tyres are designed to combine the comfort and easy running of a pneumatic tyre, and the convenience of Schwalbe\'s highest level of puncture protection.The Schwalbe Marathon Plus Evolution Wheelchair tire is one of the very best everyday wheelchair tires on the market. Schwalbe Marathon Plus Evolution Wheelchair Tires operate at 145psi and employ SmartGuard. SmartGuard is a “Flat-less” tire technology that protects Schwalbe Marathon Plus Evolution Wheelchair Tire liners from punctures while offering new levels of comfort and superior rollability among pneumatic tires. Now, you can safely navigate through dangerous obstacles like broken glass and count on Schwalbe Marathon Plus Evolution Wheelchair Tires to stay strong. Schwalbe Marathon Plus Evolution Wheelchair Tires are user friendly with 2 grip smooth sidewalls and compatibility with standard tubes. We would also like to introduce Black’n’Roll – SCHWALBE’s own revolutionary compound that allows you to wheel these black tires across indoor floor without leaving skid-marks. Key Features: SmartGuard protection,Made from recycled rubber,Weight: 470g (22x1.00).