<p>The inflation of the inner tube alone will be greater than that of the outer tube, which will affect the service life of the inner tube. The inner tube is a sealed airbag and cannot withstand significant pressure. The pressure of the inner tube relies on the outer tube.</p><p>Almost all inner tubes, once inflated to a certain extent, will exhibit uneven thickness. So first, after installing the inner and outer tubes, inflating the inner tube (which cannot be inflated separately) is the correct method of use.</p><p>Before purchasing an inner tube, please check whether the original inner tube is an American valve or a French valve, and its size, so that it can not be installed after purchase.</p><p>Material: High quality butyl rubber</p><p>Product configuration: color box packaging</p><p>Packing: 1 pcs</p>