AR-PRO (2-Pack) 110/90-19 (4.50 x 19")

When you need durable replacement inner tubes for dirt bikes or off-road motorcycles, these AR-PRO tubes offer a balance of flexibility, puncture resistance, and easy valve compatibility. Made from standard 1.6mm natural rubber and fitted with TR4 valve stems, the pair is sized to work with 4.50–4.72" wide tires on 19" rims. They’re designed to resist pinching, twisting, and abrasion common on rough trails while remaining compatible with most pumps and repair kits.

How do these tubes match my tire size and rim?

The AR-PRO set fits tires labeled 110/90-19 (4.50 x 19") up to 120/90-19 (4.72 x 19"). That range covers many off-road and enduro tire widths. For proper fit, match the tire width and confirm a 19" rim diameter.

• Fits tire widths from 110 mm (4.50") to 120 mm (4.72")
• Rim diameter: 19 inches
• Each pack contains two identical inner tubes
• Designed for common off-road tire profiles

What makes natural rubber better for off-road inner tubes?

Natural rubber at the standard 1.6mm thickness stays supple across temperature changes and conforms to tire movement during rough riding. Its elasticity reduces permanent deformation and provides improved abrasion resistance compared with some synthetic blends. That flexibility helps the tube absorb impacts instead of pinching or tearing.

• Standard 1.6mm wall thickness for balance of strength and pliability
• High abrasion resistance for rocky and sandy conditions
• Resists permanent distortion after repeated impacts
• Maintains flexibility in varying trail temperatures

Are the valve stems and puncture protection reliable?

Each tube uses a TR4 valve stem — a short, straight, threaded stem vulcanized into the tube for a secure seal. The tubes are molded evenly to reduce pinch points and improve resistance to splitting at the valve base. While no tube is immune to every puncture, these are built to limit common pinch flats and valve failures.

• TR4 threaded valve stems compatible with most hand and floor pumps
• Valve base vulcanized for a leak-resistant seat
• Even molding reduces pinch and twist-related failures
• Good puncture resistance for trail and motocross conditions

How do these tubes perform on rough trails and motocross tracks?

AR-PRO inner tubes are intended for off-road use, designed to withstand repeated impacts and abrasive surfaces encountered in motocross and trail riding. The combination of natural rubber and robust molding helps the tubes resist cutting, pinching, and premature splitting under typical off-road stresses. They make a practical, cost-effective replacement for worn or damaged tubes.

• Engineered for dirt bike and motocross conditions
• Durable construction suited to uneven terrain and obstacles
• Cost-effective alternative to OEM or specialty tubes
• Supplied as a convenient two-tube pack for spares or paired replacement

Who this is for: Riders who run 19" rims with 110–120 mm tire widths and want a dependable, flexible inner tube for off-road, enduro, or motocross use. These tubes suit weekend trail riders, racers needing quick replacements, and anyone wanting a reliable TR4-valve compatible tube that balances puncture resistance with ride comfort.