TPU Bike Tire Inner Tube — UltraLight, PunctureResistant Replacement for 20' Wheels (406 & 451) Why choose this tube Ultralight construction reduces rotating weight for faster acceleration and a snappier ride. Thermoplastic polyurethane (TPU) material provides a strengthtoweight ratio and builtin puncture resistance compared with many standard inner tubes. Compact and easy to carry as a spare on commuting, folding, or raceday rides. Key features and specifications Material: TPU (thermoplastic polyurethane) for improved durability and reduced weight. Wheel compatibility: 20 inch — fits 406 and 451 rim standards. 451 model specification: fits tire widths 0.9–1.5 inch, valve length 65 mm, weight 27 g. General weight: 25 g (as listed for the product). Design: thin, flexible construction for compact packing and straightforward installation. Functionality and performance Lightweight profile minimizes added mass and helps preserve the handling characteristics of lightweight bikes. Punctureresistant TPU reduces the frequency of flats versus many conventional inner tubes while remaining supple for a comfortable ride. Flexible material adapts to rim and tire shapes for reliable seating and inflation. Typical applications Folding and commuter bikes that use 20' (406 or 451) wheels and benefit from a light, compact spare tube. Lightweight road or city bikes with 451 sizing (0.9–1.5 inch tire width) where every gram matters and a 65 mm valve is required. Weekend rides and training sessions where puncture resistance and easy, fast replacements are important. What to check before Confirm your wheel rim standard is 20 inch (406 or 451). For 451 wheels, verify tire width is within 0.9–1.5 inch and that a 65 mm valve length is suitable for your rim depth. Compare the listed weights (25 g and 451 variant 27 g) with your requirements for spare carrying and weight savings. Packaging note Product specifications match the model and measurements listed: TPU construction, 20' (406 & 451) compatibility, 25 g general weight, and the 451 variant detailed as 0.9–1.5 inch with a 65 mm valve at 27 g.