2 Pack 18X8.50/9.50-8 Inner Tubes with TR-13 Valve Stem, Replacement Lawn Mower Tire Tubes for Tractors, Wheelbarrows, ATVs, Go Karts & More (Fits 8.5'' to 9.5" Wide)

What It Is

This is a 2-pack of 18x8.50-8 inner tubes with TR-13 straight valve stems, designed to replace worn or punctured tubes in lawn tractors, wheelbarrows, ATVs, go-karts, and similar small vehicles with 8-inch rims.

Fitment & Compatibility

Before buying, verify three things:

• Tire size: Tube fits 18x8.50-8 tires only. Do not use with 18x9.50-8 (wider) or 20x8-8 (taller) tires.
• Rim diameter: Must be 8 inches (measured bead seat to bead seat).
• Valve stem: TR-13 is straight, 1.5” long, fits most stamped steel rims. Check that your rim’s valve hole is clear and not recessed.
  No brand-specific fitment issues—works with Craftsman, John Deere, Husqvarna, MTD, and universal aftermarket wheels.

Key Things to Know

• Quality: 0.050” butyl rubber is standard thickness. Some users report minor rubber flash at seams—inspect before install.
• Installation: Moderate difficulty. You’ll need tire irons and a bead breaker. Inflate partially, then seat tube evenly to avoid pinching.
• Common gotcha: The TR-13 stem may be too short for deep-dish rims or wheelbarrow wheels with offset hubs. Measure stem clearance before mounting.
• Dual pack value: At $18.99, it’s cheaper per tube than most singles. Good for matching front/rear replacements.

Should You Buy It

Buy if you need a budget-friendly, standard 18x8.50-8 tube for a lawn tractor or utility vehicle and don’t mind a basic installation. Skip if you have odd-size rims, need a angled valve stem, or want premium puncture-resistant rubber.