4.10/3.50-4 Inner Tube Heavy Duty Replacement with TR-87 Bent Valve Stem - for Wheelbarrows, Hand Trucks, One-wheeled carts lawnmower and More (2-Pack)

What It Is

This is a heavy-duty replacement inner tube (4.10/3.50-4 size) with a TR-87 bent valve stem, designed for wheelbarrows, hand trucks, one-wheeled carts, and lawn mowers that use a 4-inch tire. It replaces worn or punctured tubes to restore air retention and tire function.

Fitment & Compatibility

• Tire size: Fits tires marked 4.10/3.50-4, 4.00-4, or 3.50-4. Measure your tire’s sidewall for these numbers—do not measure the rim alone.
• Valve stem: TR-87 is a 90-degree bent metal stem, common on wheelbarrows and carts. Check that your wheel’s valve hole aligns with a bent stem (straight stems won’t work).
• Application: Works on most residential lawn mowers with 4-inch wheels (e.g., small push mowers, self-propelled mowers with front or rear 4” tires). Not for zero-turn or commercial mowers with larger tires.
• OEM vs aftermarket: No brand-specific fit; universal for 4” wheel assemblies. Verify your tire’s internal diameter and width match 4.10/3.50-4 specs (approximately 4.1” outer diameter, 3.5” width).
• What to check: Remove the tube and measure the old tube’s size (marked on sidewall). Confirm valve stem type (bent vs straight) and hole diameter (TR-87 requires a 5/16” to 3/8” hole).

Key Things to Know

• Quality: Heavy-duty rubber (thicker than standard tubes) resists punctures from thorns or debris, but not slash-proof. Inspect the inside of your tire for sharp objects before installing.
• Installation difficulty: Moderate. Requires removing the wheel, breaking the tire bead, and fitting the tube without pinching. Use tire irons and a small amount of soapy water on the tube to ease seating.
• Common gotchas: Over-inflation can cause the tube to bulge or burst—max pressure is typically 30-40 PSI (check tire sidewall). The bent valve stem may be tricky to align through the rim hole; rotate the tire to find the best angle.
• Two-pack value: Good for replacing both wheels on a cart or mower. Store the spare in a cool, dry place to prevent dry rot.

Should You Buy It

If you have a wheelbarrow, hand truck, or lawn mower with a 4-inch tire that leaks or holds air poorly, this is a solid, affordable fix. It’s best for DIYers comfortable with basic tire work and who need a heavy-duty tube for light-to-medium use. Skip it if your tire size is different or you need a straight valve stem.