2 Pk. 18x6.50-8 18x7.50-8 Lawn Mower Tire Inner Tubes TR13 Heavy Duty

What It Is

This is a two-pack of heavy-duty inner tubes designed for 18-inch lawn mower tires with a width range of 6.50 to 7.50 inches and an 8-inch rim. They replace worn or punctured tubes in rear or front tires on zero-turn mowers, riding tractors, and commercial mowers.

Fitment & Compatibility

Before buying, confirm your tire sidewall markings. These tubes fit tires labeled 18x6.50-8 or 18x7.50-8—the width range is flexible, but the rim diameter must be exactly 8 inches. Check that your tire’s width falls within 6.50–7.50 inches; wider or narrower tires may not seat properly. These are universal aftermarket tubes, not OEM-specific, so they work with most brands (e.g., John Deere, Cub Cadet, Husqvarna, Toro) as long as the tire size matches. Do not rely on deck size or model number—always verify the tire size printed on the sidewall.

Key Things to Know

• Valve stem type: TR13 is a standard straight metal stem (1.25" long). Ensure your wheel rim has a hole that accommodates this stem—most 8-inch rims do, but check for clearance against wheel covers or brake components.
• Heavy-duty construction: These are thicker rubber than standard tubes, offering better puncture resistance but slightly more stiffness during installation. Use a tire lubricant (soapy water works) to avoid pinching.
• Installation difficulty: Moderate. You’ll need to remove the tire from the rim, deflate the old tube, and reseat the new one. A tire spoon or pry bar helps, but be careful not to pinch the new tube against the rim edge.
• Common gotcha: Over-inflating can cause the tube to bulge or rupture. Recommended pressure is typically 10–15 PSI for lawn mower tires—check your tire’s sidewall rating.

Should You Buy It

If you have a punctured or leaking 18x6.50-8 or 18x7.50-8 tire and want a durable, cost-effective fix, this two-pack is a solid choice. It’s ideal for replacing aging tubes on riding mowers or zero-turns, especially if you need a spare. Avoid if your tire size doesn’t match exactly or if you prefer tubeless tires.