Core Heavy Duty Tube - 20 x 3.5 - 4.5” SV

Designed for durability and reliable performance, this 20 x 4.0 bicycle inner tube is constructed from high-quality butyl rubber for excellent air retention and long-lasting use. Engineered to withstand demanding riding conditions, it features enhanced puncture resistance for added confidence on rough terrain. Ideal for fat bikes, e-bikes, and wide-tire applications where reliability and toughness are essential.Specifications Size: 20 x 4.0 Weight: 0.45kg (1.0lb) Wall Thickness: 1.5-2mm Valve Type: AV (Schrader) – 35mm Material: 100% Premium Butyl Rubber Tensile Strength: 7 MPa Color: Black Key Feature: Thorn-resistant construction for improved puncture protection