Air Loc Brand Tire Inner Tube with TR13 Rubber Valve Stem - 8 inch Combination Size 16x6.50-8 16x650-8 16x7.50-8 16x750-8 Lawn & Garden Designed for ATVs, Go-carts, Lawnmowers, tractors Fits Sizes: 16x6.50-8, 16x7.50-8 Tube has Standard TR13 valve stem: Straight rubber valve, the most common stem style, measuring approx. 1.38" long and used in the standard size wheel hole of approx. 1/2"