18x8.50/9.50-8 Replacement Inner Tube with TR-13 Valve Stem (2-Pack) - For Golf Cart/Tractor/Lawn Mower and More

What It Is

This is a 2-pack of 18x8.50/9.50-8 inner tubes with TR-13 (straight, short) valve stems, designed to replace worn or punctured tubes in pneumatic tires on lawn mowers, golf carts, tractors, and similar small utility vehicles.

Fitment & Compatibility

Before buying, confirm your tire’s sidewall markings match 18x8.50/9.50-8 exactly. This tube fits tires with a section width of 8.50 to 9.50 inches and a 8-inch rim diameter. It is not tire-size specific to brand (e.g., John Deere, Cub Cadet, Toro) but rather rim and tire dimensions. Measure your tire’s actual width and rim diameter if markings are worn. The TR-13 valve stem is straight and about 1.5 inches long—common on mower wheels but shorter than TR-87 (angled) stems. Check that your wheel’s valve hole aligns with a straight stem (most mower wheels do). This is a universal aftermarket part, not an OEM-specific replacement, so verify your tube size independently.

Key Things to Know

• Quality: Made of butyl rubber; generally durable for residential use but may be thinner than OEM tubes from heavy-duty equipment manufacturers.
• Installation: Moderate difficulty. You’ll need a tire spoon or pry bars, a valve core tool, and a compressor. Watch for pinching the tube between rim and tire bead during installation—use soapy water to lubricate.
• Common gotcha: Over-inflation is the top cause of early failure. Recommended pressure is typically 12–18 PSI for mower tires; check your tire’s sidewall for max rating. The TR-13 stem can be brittle if overtightened—use a stem nut only finger-tight plus a quarter turn.
• 2-pack value: Cheaper than buying singles, but if you only need one, check if a single is available at a lower price.

Should You Buy It

Right for you if you have a standard residential lawn mower, garden tractor, or golf cart with 8-inch rims and need a reliable, budget-friendly tube replacement. Skip if you require heavy-duty, commercial-grade thickness (e.g., for zero-turn mowers with high loads) or need an angled valve stem for clearance issues.