Fit For 3.00-12 80 100-12 Inner Tube Tyre For 50-190cc Dirt Bike Motorcycle Spare Parts suits all 50-190cc dirt bike models; Fit For sizes 3.00-12 80 100-12 rim structures slides smoothly into rims; installs fast without complex steps holds steady internal pressure; reduces frequent ups during off road rides crafted with thick elastic rubber layers; uniform wall thickness to resist surface punctures follows standard 12 inch rim sizing specs; matching tube curvature to fit designated frames