AR-PRO Replacement 18x8.50-8 18x9.50-8 Inner Tubes for Golf Cart, ATV, UTV, Lawn Tractor, Garden Trailer, Snow Blowers, and More - with TR-13 Straight Valve Stems - Made from Durable Butyl Rubber

What It Is

This is a replacement butyl rubber inner tube (18x8.50-8 or 18x9.50-8) with TR-13 straight valve stems, designed for pneumatic tires on golf carts, ATVs, UTVs, lawn tractors, garden trailers, and snow blowers. It’s a direct swap for worn or punctured tubes to restore tire sealing and air retention.

Fitment & Compatibility

• Tire size: Fits tires marked 18x8.50-8 or 18x9.50-8. The tube stretches to accommodate both widths. Do not use for other rim diameters (e.g., 9-inch or 10-inch wheels).
• Rim diameter: 8 inches only. Check your tire sidewall for “18x8.50-8” or “18x9.50-8” before ordering.
• Valve stem: TR-13 (straight, rubber, ~1.5-inch length). Common on lawn tractors and small utility vehicles. If your rim has a hole for a 90-degree or metal stem, you may need an adapter or different tube.
• Brand/Model: Universal fit for most brands (John Deere, Cub Cadet, Toro, etc.) using 8-inch rims with standard 18-inch outer diameter tires. Not for zero-turn mowers with 20-inch+ tires.
• OEM vs aftermarket: Works as a direct replacement for OEM tubes; no modifications needed if tire and rim match.

Key Things to Know

• Durability: Butyl rubber resists air loss better than natural rubber; less prone to dry rot. However, it’s still a tube—avoid sharp debris or pinch flats during installation.
• Installation difficulty: Moderate. You’ll need tire irons, a valve stem tool, and patience. Overstretching can tear the tube. Use a little soapy water on the tube/rim to ease seating.
• Valve stem note: TR-13 is straight—ensure your rim’s valve hole is straight and unobstructed. Bent or offset holes may cause stem damage.
• Common gotcha: Don’t inflate fully before seating the tube inside the tire—partial inflation (5-10 PSI) helps avoid pinching. Final pressure: typically 10-20 PSI for lawn tractors (check tire sidewall).

Should You Buy It

If you need a budget-friendly, reliable tube for an 8-inch rim on a lawn tractor, garden trailer, or small utility vehicle, this is a solid choice. The butyl rubber holds air well, and the price is fair. Avoid it if you have a zero-turn or need a 90-degree valve stem—those require a different tube. For standard replacements, it’s a safe buy.