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【Size】20x2.5/3.0 Heavy Duty Mountain bike inner tubes two sets with AV32mm (Regular valves). Fits 20 x 2.5/3.0" mtb/ road/ city/ racing/ mountain bicycle tyres. 【New upgraded thicker inner tube】The 20 inch inner tube weight is 30% heavier than the ordinary inner tube on the market, and the upgrade can be seen to make the inner tube more durable. 【More Durable】The bike tyre tube 20x2.5 20x3.0 is made from premium butyl rubber. It features better sealing performance, ozone resistant, anti-aging, shock absorption and electrical insulation merits. 【Easy to Install】Installing the bicycle tubes is quick and easy with the provided operating tools. Please follow the inflation guide when inflating a tire from completely flat. Replacing your old tire tubes is hassle-free and can be done within minutes, saving time and ensuring efficiency. 【Safe Bike Tires】The elastic butyl rubber tire tubes absorb shocks on bumpy roads, ensuring a comfortable and safe ride. They are heat-resistant and withstand wear and tear for daily use. 【Please Note】Please check the side of your tyre for the tyre size your bike uses. 【100% Product Quality Guarantee】We hope to do better in the bike tires and tubes accessories, hope to listen to friends' opinions and suggestions, in order to provide better service and more satisfactory products.If there is any problem on the product within 180 days, you can get in touch with us, and you need to provide evidence pictures and relevant situation descriptions, so that we can respond quickly and save your precious time. We will try our best to satisfy you. Thank you for your trust!