The Schwalbe Marathon Plus Gray (Wheelchair) 24x1 3/8/37-540 is the most reliable pneumatic tire for wheelchairs. This tire has a SmartGuard puncture protection layer made from recycled natural rubber. The "Anti-Aging" sidewall can withstand overload from low air pressure for longer. The gray tire is suitable for urban use. It offers high puncture protection and is not reflective. The tire is non-folding and has an ETRTO of 37-540. The tire weighs 780 grams. It is suitable for 24-inch wheels and can handle a maximum pressure of 6 bar. It is not certified for e-bikes. Product specifications: - Brand: Schwalbe - Primary base color: Gray - Type: Marathon - Use: City - Puncture protection: High - Reflection: No - Foldable: No - ETRTO: 37-540 - Weight (grams): 780 - Inch size: 24 - Maximum pressure: 6 - E-bike quality mark: None