YunSCM 2-Pack 20 inch Fat Bike Inner Tubes 20x4.0/4.50 ETRTO 98/102-406 AV48mm Valve Compatible with 20x4.0 20x4.10 20x4.20 20x4.30 20x4.50 Road bike / E-Bike Tyre Tubes

【Size】Bicycle inner tubes 20" X 4.0" American valve AV48mm, compatible with 20x4.0/4.5 Road bike /Mountain bike Tire 20 X 4.0 / 20 X 4.1 / 20 X 4.2 / 20 X 4.3 / 20 X 4.4 / 20 X 4.5 ( ETRTO : 100-406/114-406 ) bicycle tire tubes. 【High Quality】The bike tyre tube is made from premium butyl rubber.It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, electrical insulation. 【Easy Installation】The bike tube installation is quick and easy. Please follow inflation guide when airing a tire from a complete flat. Save time and effort, replace the old tube in a few minutes. 【Important Note】When changing a bicycle inner tube, be sure to add a little air before installing it. This gives it form so it doesn't get twisted or bunch up which may cause a pinch flat. Inspect for an even bead of the tire to the rim on both sides. 【Comfortable and Safe】After replacing the butyl rubber tube, it absorbs the impact on the uneven road surface, making riding more comfortable and safe. 【After-sales Service】If there is any problem about the product, you can contact us, we will try our best to solve for you! 【100% Product Quality Guarantee】We hope to do better in the tire, 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!