AR-PRO 110/100-18 (4.50x18) Motorcycle Inner Tubes — 2-Pack, 3mm Butyl with TR4 Valve

These AR-PRO 110/100-18 (4.50 x 18) inner tubes are a two-pack of 3mm thick butyl rubber tubes with TR4 valve stems built for heavy-duty off-road and motocross use.

When you need dependable replacement inner tubes for dirt bikes or off-road motorcycles, these AR-PRO tubes combine thicker butyl compound, reinforced construction, and standard TR4 valves to deliver a more durable, airtight option than many generic tubes. The 3mm wall thickness improves resistance to pinch flats and punctures while the vulcanized TR4 stem ensures secure seating and easy inflation with common pumps. This product page explains how these tubes work, what they fit, and why riders choose heavier-duty butyl tubes for rough terrain.

Will these tubes fit my tire and rim?

Yes — these tubes are sized for tires labeled 110/100-18 or 4.50 x 18 and are intended for 18-inch rims with a 110 mm (4.50 in) nominal tire width. They’re a direct replacement when your current inner tube uses a similar sizing specification.

• Size: 110/100-18 (4.50 x 18) compatibility
• Rim diameter: 18 inches
• Pack quantity: 2 inner tubes per order
• Intended for standard 18-inch off-road and motocross wheels

How do the 3mm butyl walls improve ride durability?

The 3mm butyl construction provides thicker walls than many standard tubes, increasing resistance to punctures, pinch flats and valve-area failures. That added thickness also dampens vibration and helps the tube retain air better during heavy use on rough tracks.

• 3mm butyl rubber for improved puncture and abrasion resistance
• Better airtightness than thinner compounds for longer inflation retention
• Reduced risk of twisting or splitting at the valve base

What type of valve does it use and is it easy to inflate?

Each tube ships with a TR4 valve stem — a short, straight, threaded valve that’s widely used for motorcycle inner tubes. TR4 valves are compatible with most hand pumps and air compressors, and these stems are vulcanized into the tube for a secure fit.

• Valve: TR4 (short, straight, threaded)
• Vulcanized valve seating to prevent leaks and pull-out
• Works with standard pump heads and adapter fittings

Are these tubes suitable for motocross and off-road conditions?

They are designed specifically for off-road and motocross applications where impacts, sharp rocks and frequent rough landings increase failure risk. The heavier butyl and robust molding aim to offer a balance of durability and ride comfort for aggressive riding environments.

• Intended for dirt bikes, motocross and off-road motorcycles
• Engineered to resist pinch flats from rocks and obstacles
• Even molding reduces weak points and valve-area stress

Who is this for: Riders who regularly tackle rugged trails, amateur racers, and anyone seeking a more robust, longer-lasting inner tube replacement for 18-inch off-road wheels will appreciate these AR-PRO 110/100-18 tubes. They’re a practical choice when you want thicker butyl protection, reliable TR4 valve performance, and a two-pack for spares or dual-wheel servicing.