The new flat-less tire for the wheelchair. The Marathon has become the absolute benchmark for puncture-resistant pneumatic tires on wheelchairs. A portion of the SmartGuard protection belt is made of recycled natural rubber. The 'anti-aging' sidewall construction can withstand typical overloading caused by low inflation pressure for much longer.SmartGuardThe safest puncture belt for bicycle tires. Unbeatable for more than 15 years. It has proven itself in practice more than any other tire. Only tires with SmartGuard are real flat-less tires. Available exclusively from Schwalbe. Black'n'RollWheelchairs with black tires Schwalbe has made it possible. They developed a special Black'n Roll compound that does not leave unsightly marks on indoor floors. Additionally it is far more robust and much longer lasting.