YunSCM 20 1 best choice for 60mm high rims with Presta 20x1 bicycle suitable for 1 road bikes and 2-pack, 3/8" thick-walled tubes, valves, 3/8 tubes,

✅【20"x1 3/8 Bicycle Tube, Thick Wall】: Suitable for 20"x1 3/8 bicycles, 60mm Presta valve, best choice for high rims. Suitable for children's bikes, road bikes, mini bikes, folding bikes, wheelchairs, etc. Note: Please check your tire size before purchasing. Tire size is usually indicated on the side of the outer tire. ✅【Thick, High-Quality Butyl Rubber】: This is a thick, upgraded type of bicycle tube, highly durable and puncture-resistant. This material provides better airtightness, allowing it to retain air for a longer time, eliminating the need to constantly inflate it. ✅【New Thickened Design】: To meet the needs of customers who frequently ride bicycles on a daily basis and to further enhance the durability of the tube, we have developed a reinforced tube that is approximately 25% thicker than the standard version, with a noticeable increase in thickness. This improves the tube's explosion resistance and puncture resistance. ✅【Space-saving and easy to carry】: The 20x1 3/8 bicycle tube folds down to a small size, making it easy to carry when riding long distances while out and about, and avoiding the awkward situation of being unable to ride after a puncture. ✅【Budget Saving】: Doing it yourself will save you money compared to going to a local shop to change your tires. It can also serve as a spare tube, preventing the awkward situation of being unable to ride after a tube bursts. ✅【Correct Installation Method】: First, push the tube into the rim and inflate it with a small amount of air (20%). Next, mount the tire, making sure the edges of the tire and rim are aligned and the tube is not pinched, then inflate the tube to the correct pressure again. (Please note that if the tube and tire are not inflated together, i.e., if only the tube is inflated, or if the tube is pinched between the tire and rim, air leaks or punctures may occur.) Suitable for 20-inch wheels. Tire width is 1 3/8 inches (1.375 inches). The product is two bicycle inner tubes. Warm tips for installing tires and tubes: 1. The direction of tire rolling is the same as the direction in which the tire is mounted (some tires are indicated by an arrow, and the direction of the arrow indicates the direction of tire rolling). Clean the inside and outside of the tire to prevent the presence of foreign matter such as gravel and impurities, and mount the tire according to the direction of tire rolling. 2. After installation, inspect whether the bead (tire edge) is uniformly symmetrical. The bead must be outside the bead at all points and parallel to the bead at all points. Otherwise, there will be wobble while driving. 3. Insert the tube evenly into the tire with a small amount of air (less than 10%), ensuring the carcass is stacked in order and not folded inside the tire (folding it while inflating makes it prone to punctures). Place the tube and tire together over the steel ring, checking that the bottom tire is fully packed into the tire, and ensuring there are no small gaps between the tire and the steel ring. You can then begin aerating the tube. Installation is complete.