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Size: 32 mm (normal valve). Suitable for 20 x 4.0/4.5 thick inner tubes. 【High Quality】The bicycle tube is made of high quality butyl rubber, which has advantages such as good sealing performance, ozone resistance, aging resistance, shock absorption and electrical insulation. 【Easy to install】The installation is quick and convenient. When inflating a tyre in case of a full blowout, please refer to the inflation guidelines. Save time and effort by replacing old hoses within minutes. IMPORTANT NOTICE: Be sure to add some air before installing the inner tube. This allows it to be shaped to avoid twisting or stacking, which can lead to flattening. Check if the tyre beads are uniform on both sides of the tyre. After replacing the butyl rubber tube, it absorbs the shocks on uneven roads and makes cycling more comfortable and safer. › See more product details