AR-PRO Inner Tubes 110/100-18 (4.50x18) 2-Pack — TR4 Valve, 1.6mm Natural Rubber

These AR-PRO 110/100-18 (4.50 x 18) inner tubes are a two-pack of natural rubber, TR4-valve tubes built to resist pinches and punctures for off-road and motocross use.

Riders who need dependable replacement inner tubes for 18-inch dirt bike wheels will find this two-pack designed specifically for 110/100-18 (4.50 x 18) tires. Made from standard 1.6mm natural rubber and fitted with TR4 straight threaded valve stems, these tubes strike a balance between flexibility and durability so they flex with the tire and stand up to rough terrain. The set includes two tubes, each vulcanized around the valve to enhance seal integrity and reduce twisting or splitting near the stem.

How will these tubes hold up on rocky or root-filled trails?

The tubes use natural rubber with a standard 1.6mm wall thickness that delivers abrasion resistance and puncture tolerance while remaining pliable. Their even molding and resilient material help prevent sudden failures from pinching against the rim or slicing from sharp objects.

• Natural rubber compound resists permanent distortion
• 1.6mm thickness balances flexibility with toughness
• Even molding reduces pinch points during impacts
• High puncture resistance for rough off-road conditions

Are the valve stems compatible with common pumps and repair gear?

Each tube is equipped with a TR4 valve stem — a short, straight, threaded stem that fits most hand and track pumps as well as standard valve tools. TR4 is a widely used motorcycle tube valve, so replacing cores or seating the stem is straightforward.

• TR4 threaded stems work with common pump heads and valve tools
• Vulcanized valve base reduces twisting and air leaks
• Short, straight design simplifies inflation and core replacement

Will these tubes fit my dirt bike and how many tubes are included?

The tubes are sized for tires that list 110/100-18 or the equivalent 4.50 x 18. This listing includes two inner tubes, making it convenient for owners who replace both tires or keep a spare on hand for trail repairs.

• Correct fit for 110 mm width, 18-inch rim diameter (4.50 x 18)
• Two tubes per pack for front and rear or a spare
• Clear sizing reduces installation errors

How do these tubes help reduce dangerous pinch flats?

The combination of proper wall thickness, consistent molding, and flexible natural rubber reduces the risk of pinching between tire and rim during impacts. That lowers the chance of sudden, explosive failures and improves ride safety on motocross tracks and trails.

• Flexible rubber cushions impacts, reducing pinch flat likelihood
• Evenly molded walls limit weak spots that lead to splits
• Vulcanized valve seating reduces stress points around the stem

Who is this for: These AR-PRO tubes are intended for off-road and motocross riders, dirt bike mechanics, and weekend trail riders who need reliable, OEM-style inner tubes for 18-inch rims. If you want a cost-effective pair of replacement tubes that work with standard pumps and offer improved resistance to pinching and punctures, this two-pack is a practical addition to your maintenance kit or spares bag.