Looking for maximum protection from flat tires? Marathon Plus with SmartGuard belts are what you need. Smart Guard protects against the biggest puncture problems experienced by everyday cyclists -- objects that embed in the tread and insidiously work their way through even the most sophisticated puncture protection belt as the tire rotates against the road. Smart Guard is one solution that works on these 'time bombs' such as shards, flints and glass.
The laboratory had to redevelop test procedures in order to puncture the tube inside the Marathon Plus. None of the usual tire destroyers like glass, flints or shards would penetrate the tread and only by extreme application of force could the technicians break through the protection. This puncture protection is due to the five millimeter thick Smart Guard belt made from special India rubber that in conjunction with the tread and carcass brings the total to almost a centimeter of material between the tube and road.
Smart guard tires are a great choice for recumbent riders who want maximum protection against flat tires.