Schwalbe Durano DD 700 x 28C Addix Folding Bike Tyre - RaceGuard / PerfSchwalbe Durano DD 700 x 28C Addix Folding Bike Tyre RaceGuard Perf This Durano HS464 DD tire, in addition to its extreme durability, has retained its exceptional qualities such as its extremely high rolling capacity. It attaches very well to wet or difficult surfaces thanks to its Dual Compound. Features: DD: Double Defense means that there is a RaceGuard underlay under the tread and additional side protection to minimize the risk of punctures for