Gravel Grinder | Challenge Tires
Properties. Pressure: 4 bar. Safety Limit: 600 kPa. Use the Black Friday code at the end of the checkout process: fridaychallenge. 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 hookup when the terrain gets soft, muddy, or a bit sketchy.