The Marathon Plus range is one of Schwalbe's most popular ranges of tyres. There is a great reason for this when considering they're both endurance and puncture resistance. The SmartGuard layer made from a flexible, special rubber and offers particular resistance to shards of glass and flints. The MARATHON PLUS rolls as easily as a tire without protection. It is impossible to guarantee that a flat will never happen, but the Marathon Plus has the best defence against everyday tire wreckers such as those glass, flints or metal shards. Even a thumbtack cannot penetrate this protective layer. The SmartGuard belt does not increase rolling resistance. Use a pressure gauge to adjust tire pressures as the common 'thumb check' is insufficient due to the special construction of the Marathon Plus.