Duro Bicycle Tube 650B/27.5 x 2.25/2.35/2.50 57/64-584 FV 40 mm

High-performance 650B/27.5" inner tube engineered for modern gravel and mountain bike applications. Precision-sized 57/64-584 ETRTO dimensions accommodate 2.25", 2.35", and 2.50" tyre widths across a wide range of riding conditions. The French valve (FV) design with a 40mm stem length provides reliable, secure valve engagement without adapters. Constructed from a premium butyl rubber compound for puncture resistance and durability. Ideal for riders seeking dependable tube performance in off-road environments with minimal weight penalty. Fits standard 650B/27.5" wheel systems.