Gravel Grinder | Challenge Tires
Safety Limit: 400 kPa. 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. For a perfect tubeless setup use Challenge Smart Sealan t ! Brown 700 × 33mm. Black 700 × 33mm. Brown 700 × 38mm.