Punctures are a memory. The SmartGuard layer made from a flexible, special rubber offers particular resistance to shards of glass and flints. Even a thumbtack cannot penetrate this protective layer. The SmartGuard belt does not increase rolling resistance. The MARATHON PLUS rolls as easily as a tyre without protection. Note: It is impossible to guarantee that a flat will never happen, but the Marathon Plus has the best defense against everyday tyre wreckers such as glass, flints or metal shards.
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