Schwalbe Smart Sam - One for all. An impressive all-rounder with good all-round properties. For all those who like to switch between road and off-road on their MTB. The distinctive off-road tread pattern with compact centre bar ensures pleasant, low-vibration rolling behaviour and particularly long durability. Angular outer lugs provide the rider with safety and optimum grip off-road. K-Guard: Natural rubber insert reinforced with Kevlar fibres. TwinSkin: An additional rubber coating on the side protects against cuts and enables uniform colouring. Black N Roll: e rubber compound for wheelchair tyres; leaves no dark abrasion marks on indoor floors and lasts significantly longer than a grey wheelchair compound.