Schwalbe marathon plus 16 bike tyre smartguardpunctures are a memory the smartguard layer made from a exible special rubber offers particular resistance to shards of glass and ints even a thumbtack cannot penetrate this protective layer the smartguard belt does not increase rolling resistance the marathon plus rolls as easily as a tire without protection features size16 x 135 etrto35 349 smartguard compoundendurance bar4 0 6 5 psi55 95 epi67 load65kg weight475gbuyschw