18x8.50-8/18x9.50-8 Inner tube replacement parts, equipped with TR-13 valve stem, suitable for lawn mowers,Wheelbarrows, Hand Trucks, Carts, lawn and garden inner tubes (pack of 2)

What It Is

This is a pack of two replacement inner tubes for pneumatic tires sized 18x8.50-8 or 18x9.50-8. They’re designed for lawn mowers, wheelbarrows, hand trucks, and garden carts that use tubed tires, providing an airtight seal to hold tire pressure.

Fitment & Compatibility

• Tire size: Fits tires marked 18x8.50-8 or 18x9.50-8. The 18 is the outer diameter (inches), 8.50/9.50 is the width, and 8 is the rim diameter. Both sizes share the same rim (8"), so this tube works for either.
• Valve stem: Equipped with a TR-13 (straight metal) valve stem—common on lawn and garden equipment. Ensure your rim has a hole large enough for a TR-13 stem (typically 0.625" or 5/8").
• Brand/model: Universal fit—no specific brand or model restrictions. Works with any machine using tubed tires in these sizes, including riding mowers (e.g., John Deere, Cub Cadet, Husqvarna), walk-behinds, wheelbarrows, and utility carts.
• Check before buying: Measure your existing tire sidewall for 18x8.50-8 or 18x9.50-8 markings. Confirm your tire uses a tube (not tubeless). Inspect rim for damage or rust that could puncture the new tube.

Key Things to Know

• Quality: Users report good durability for the price. The TR-13 stem is metal and holds up better than rubber stems on heavier loads.
• Installation difficulty: Moderate. You’ll need tire spoons or pry bars to break the bead and remove the tire. Watch for pinching the tube during reinstallation—dust with baby powder or soapy water to reduce friction.
• Common gotchas: Over-inflating can cause the tube to bulge between tire and rim. Stick to 20-30 PSI (check tire sidewall). Also, if your tire has a 18x9.50-8 marking, this tube fits fine, but a narrower 18x8.50-8 tire may feel looser—still safe if centered properly.
• Pack of two: Good for matching front/rear or replacing both on a two-wheel cart or wheelbarrow.

Should You Buy It

Buy this if you need a budget-friendly, reliable replacement for 18x8.50-8 or 18x9.50-8 tubed tires on lawn equipment, wheelbarrows, or carts. It’s a solid value for the price, especially if you’re replacing two tubes at once. Skip it if your tire is tubeless or if you need a different valve stem type (e.g., TR-15 for larger rims).