The Kenda Tube - 20 x 2.80-3.00 | 35mm Schrader Valve is the genuine Kenda standard butyl replacement tube for plus-size and fat 20-inch tires, with full e-bike rating for cargo bikes, fat-tire commuters, and kids&'; bikes running wider rubber. It fits any tire measuring 2.80 through 3.00 in width on a 406 ETRTO rim, which covers the wide-tire 20-inch builds that have become common as cargo e-bikes and kids&'; fat bikes take over driveways and city streets. Built with 1mm butyl rubber wall thickness and seam-sealed construction, the tube holds air reliably and stands up to the higher loads e-bikes put on a wheel. The 35mm Schrader valve fits standard pumps at any gas station or hardware store. Low-lead construction meets California Prop 65 standards. This is the right call for owners of plus-size 20-inch e-bikes, fat-tire kids&'; bikes, and cargo bikes needing a dependable spare or replacement tube.