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. Installation Precautions?Please check the side of your tire for the tire size your bike uses. Size?32mm (Regular valve). Fits 20" x3.5/4.0" tire tube.

Wheel Size: 20 Inches. Bike Type: Mountain Bike. Material: Butyl Rubber. Valve Type: Schrader. Brand: YunSCM. Date First Available: March 8, 2021. Best Sellers Rank: #6,942 in Sports & Outdoors. Customer Reviews: 4.5 out of 5 stars 861 ratings 4.5 out of 5 stars. : B08Y8MVG2D. Model Year: ?2022. Part Number: ?YunSCM20210306120. Manufacturer: ?YunSCM20210306120. Material: ?Butyl Rubber. Brand Name: ?YunSCM. Item Dimensions LxWxH: ?3.15 x 2.76 x 1.18 inches. Package Weight: ?0.81 Kilograms. Item Package Dimensions L x W x H: ?6.06 x 4.8 x 4.21 inches.