The trigger rolls fast on asphalt hard pack and gravel paths ideally for those looking to get the most out of a smooth fast cyclo cross course or your favorite gravel roads this tyre rolls great on and off road the 38c produced with endurant casing and blackbelt for extra puncture protection casing 60 tpi bead foldable butyl wrapped bead 2bliss ready flat protection endurant casing and blackbelt