YunSCM Set of 2 Bicycle Folding Tires Tubes with 32mm Schrader Suitable for 18x2.125 Tires, 18x2.125 57-355 + 18x1.75/2.125 Valves, 18-inch 2.125

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✅【Applicable Scope】: Suitable for children's and folding bikes with outer tire size 18x2.125 (Etrto 57-355) and 32mm Schrader valves. Tire pressure: 40 PSI. The tube's air intake is the same as that of motorcycles and cars, making inflation easy and convenient. You can now use the same tire pressure gauge as in your car, making tire pressure management much easier. Note: Please check your tire size before purchasing. Tire size is usually printed on the side of the outer tire. ✅ [Super Durable, New Design Folding Tires]: The new design folding tires reduce vibrations quickly, giving you a smoother feeling on the ground. The 18 2.125 tires are made of high-quality rubber and high-knit yarn, providing strong grip and excellent wear resistance. ✅【Foldable】: 18x2.125 bicycle tires and tubes are all foldable, small in volume after folding, easy to carry, and can be put into a bag as a spare tire for long-distance travel. ✅【Budget-Saving】: Do-it-yourself tire replacement is much more cost-effective than going to a local shop. As a spare bicycle tube, it can prevent the embarrassment of being unable to ride after a tube bursts. ✅ [Proper Installation]: First, push the tube onto the rim and inflate it with a small amount of air (20%). Next, install the tire, make sure the edges of the tire and rim are aligned and the tube is not pinched, and then inflate the tube to the appropriate pressure. (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 and punctures may occur more easily.) Suitable for children's and folding bicycles, the wheel diameter is 18 inches and the tire width is 2.125 inches. The product includes two 18x2.125 bicycle tires and two 18x1.75/2.125 bicycle tubes. Regarding shipping: Shipping is timely, the package is stored in the Amazon warehouse, and once your order is received, Amazon will ship your product in a timely manner. Tire installation instructions and precautions: 1. The rolling direction of the tire is the mounting direction of the tire (some tires are indicated by an arrow, and the direction of the arrow is the rolling direction of the tire). First, clean the inside and outside of the tire to prevent the presence of gravel, impurities, and other foreign objects, and then install the tire according to the rolling direction. 2. After installation, check whether the bead (tire edge) is uniform and symmetrical, and the bead must be outside the bead at all points and parallel to the bead at all points, otherwise there will be shaking when driving. 3. Insert the tube evenly into the tire with only a small amount of air (less than 10%). Stack the carcass in an orderly manner and do not fold it inside the tire (inflating it while folded is likely to cause a puncture). Place the tube and tire together on the steel ring and check that the bottom tire is fully packed into the tire and that there are no small gaps between the tire and the steel ring. Then you can begin inflating the tube. This completes the installation.