2.80-4 Innertube, Part #136-5
2.80-4 Innertube with bent angle valve stem. This tube is marked 2.8-4 and is the most popular size used on stand-up gas scooters with 4 inch rims. 2.80-4 innertube. Fits 9x3.5-4 tire but can work with many other tires with 4 inch rims. Bent Angle Valve Stem.