?Comfortable and Safe?After replacing the butyl rubber tube, it absorbs the impact on the uneven road surface, making riding more comfortable and safe. ?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. ?Easy Installation?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. ?High Quality? The bike tube is made from premium butyl rubber.It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, electrical insulation. ?Valve Size/Type? 33mm Valve. ?Size?20x 3.0-3.50 Fit 20-inch wheel, tire width between 3.0-3.5. weight 270G.

Wheel Size: 20 Inches. Bike Type: Road Bike. Material: Rubber. Valve Type: Schrader. Brand: YunSCM. Date First Available: May 17, 2021. Best Sellers Rank: #13,802 in Sports & Outdoors. Customer Reviews: 4.6 out of 5 stars 308 ratings 4.6 out of 5 stars. : B0952RKJ5R. Model Year: ?2022. Part Number: ?YunSCM517136. Manufacturer: ?YunSCM517136. Material: ?Rubber. Brand Name: ?YunSCM. Package Weight: ?0.68 Kilograms. Item Package Dimensions L x W x H: ?6.69 x 5.08 x 3.27 inches.