Polymer Workshop GravelKing Slick RDesigned for ultimate speed and low rolling resistance across diverse gravel and hard pack terrains. The GravelKing Slick R (likely referring to a variant of the Panaracer GravelKing Slick) is a high performance gravel tire engineered for riders seeking maximum efficiency and speed on fast courses and varied surfaces. Its smooth center tread minimizes rolling resistance on hard packed gravel and pavement, while subtly textured shoulders provide