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.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. Use a pressure gauge to adjust tyre pressures as the common 'thumb check' is insufficient due to the special construction of the Marathon Plus.Size: ETRTO 35-349 (16 x 1.35 Inch)Compound: EnduranceExecution: SmartGuard,Performance LineColour: Black-ReflexSkin: TwinWeight: 475 g (17 oz)Pressure: 55-95 psi (4,0-6,5 Bar)Maximum load: 65Tread: HS 348