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<http://schema.org/description>
"Make your mark on the gravel scene with the Gravel Grinder. This tire combines a fast-rolling diamond center with aggressive shoulder knobs that only hook-up when the terrain gets soft, muddy, or a..."
<https://www.skivalleyonline.com/product/challenge-gravel-grinder-race-vulcanized-clincher-355350-1.htm>