Mitas 12" Heavy Duty Bent Valve Inner Tube

Keep your 12-inch wheels rolling with confidence using the Mitas 4.00/4.50-12 Inner Tube . Molded from high-density butyl rubber and engineered in Europe to rigorous performance standards, this heavy-duty tube resists seam splits, pinch flats, and thermal breakdown — delivering exceptional pressure retention under prolonged loads. An ideal replacement for wide 12-inch fat-tire scooters, mini-motos, and sidecars. Key Features Premium Butyl Rubber: Uniform wall thickness and high elasticity reduce natural air migration and resist ozone degradation over time. 90° Bent Metal Valve Stem: Pre-angled JS87/DIN7777-style metal valve provides easy inflation access on tight 12-inch wheel hubs and split rims. Reinforced Valve Base: Extra-thick vulcanized rubber pad absorbs rotational stress and prevents pull-shear flats at the stem. Thermal Stability: Withstands high internal rim temperatures generated during prolonged braking on smaller wheel platforms. Technical Specifications Rim Diameter: 12 inch Supported Tire Widths: 4.00" to 4.50" Valve Stem Type: 90° Bent Metal (JS87 / DIN7777) Material: High-density butyl rubber SKU: 136-138 Size & Fitment Guide Imperial Size Metric Equivalents Application 4.00-12 / 4.00x12 110/90-12, 120/70-12 Standard 12" scooter front/rear rims 4.25-12 / 4.25x12 120/80-12, 130/60-12 Mid-profile urban commuters 4.50-12 / 4.50x12 130/70-12, 130/80-12, 140/70-12 Fat-tire variants and custom mini-bike setups Installation Tips Always inspect the inside of your tire carcass for sharp debris, wire remnants, or burrs before inserting the new tube. Dust the inside of the tire casing with talcum powder before sliding the tube in — this prevents rubber-to-fabric sticking and reduces the risk of pinch flats. About Mitas Mitas is a leading European tire manufacturer with decades of experience producing high-quality tires and tubes for motorcycles, scooters, and specialty vehicles. Their products are engineered to meet strict European performance and safety standards, making them a trusted choice for riders worldwide. California Prop 65 Warning: www.p65warnings.ca.gov