YunSCM 2-Pack Fat Tyre Bike Inner Tubes 20 x 4.0 AV32mm Schrader Valve 20" Fat Tyre Tubes Compatible with 20x3.5/4.0 Mountain Bike/Bicycle Fat Tyre Tubes

【Size】Bike tyre tube fits 20" x 3.5/4.0" AV32mm Valve tyre tubes. 【Installation Precautions】Please check the side of your tyre for the tyre size your bike uses. 【High Quality】The bike inner 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 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 & 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!