Virtually Puncture Proof*....Unfazed by even a heap of broken glass.The MARATHON PLUS certainly isn't a competition tyre, but it will master the challenges of everyday cycling life. Puncture Protection: The Smartguard anti-puncture belt is made from a flexible, special rubber that offers particular resistance to thorns and shards. Even a typical drawing pin cannot penetrate this protective layer.Easy rollingThe Smartguard belt does not increase rolling resistance. The MARATHON PLUS rolls as easily as a tyre without protection*Note: Virtually Puncture Proof;Like everything else in the world, this tyre can also be destroyed, but it provides the very best defence against everyday tyre wreckers like glass, flints or metal shards.Reflex Sidewall. Smartguard Anti-PunctureWire Bead. (67 Tpi)28" x 1 1/2" (1010g) 50-85 Psi 700x25C (590g) 70-115 Psi700x28C (740g) 55-100 Psi700x32C (790g) 55-95 Psi700x35C (890g) 50-85 Psi700x38c (940g) 50-85 Psi