GDHSWJ 21" Dirt Bike Inner Tubes 2-Pack 2.75/3.00-21 (80/100-21) TR4 Metal Valve, 2mm Heavy-Duty

These GDHSWJ 21-inch inner tubes (2.75/3.00-21 / 80/100-21) are heavy-duty natural rubber tubes with a 2mm wall and TR4 metal valve, sold as a 2-pack for reliable off-road use.

When you need a durable replacement tube for a 21" dirt bike tire, these GDHSWJ inner tubes balance puncture resistance, air retention, and compatibility. Built from quality natural rubber and fitted with a straight TR4 metal valve stem, they suit a wide range of off-road motorcycles and are designed for frequent use, quick repairs, and stable inflation across rough terrain.

Which tires and bike models do these tubes fit?

These tubes are sized for 21-inch rims and match 2.75/3.00-21 and 80/100-21 tire measurements. They are intentionally made to be broadly compatible with many popular dirt and dual-sport models, simplifying replacement shopping.

• Fits 2.75/3.00-21 and 80/100-21 tire sizes.
• Compatible with many Honda, Kawasaki, Suzuki, Yamaha models and similar 21" dirt bikes.
• Sold as a 2-pack so you can replace both front and spare tubes as needed.

How does the 2mm thickness and natural rubber construction help on trails?

The 2mm wall thickness strikes a balance between flexibility and toughness, absorbing shocks without becoming too stiff. Natural rubber offers elasticity and reliable sealing, which helps maintain pressure and cushions against roots, rocks, and ruts.

• 2mm wall improves puncture tolerance while remaining flexible.
• Natural rubber delivers consistent air retention and shock absorption.
• Durable under repeated use on rough, uneven surfaces.

What makes the TR4 metal valve stem beneficial for riders?

The straight TR4 metal valve stem provides a secure, long-lasting connection to the rim and resists bending during frequent inflation or tire changes. Metal valve stems are also easier to access with pumps and pressure gauges and reduce the chance of leak-prone failures compared with some rubber-only valves.

• TR4 straight metal valve minimizes bending and leaks.
• Works well with standard pumps and tire gauges for quick inflation.
• Sturdy design speeds up roadside tube swaps and maintenance.

How does this 2-pack support maintenance and ride readiness?

Having two tubes in the kit means you can carry a spare or replace both front and rear tubes at once, reducing downtime. The tubes’ reliable air retention and straightforward fitment make them practical for riders who maintain their bikes regularly or prepare for long trail days.

• Two tubes in one package — convenient for spares or dual replacements.
• Good waterproof sealing that lowers frequency of top-ups.
• Easy to store and transport as part of a trail tool kit.

Who is this for: These GDHSWJ inner tubes are aimed at dirt-bike and dual-sport riders who need a dependable, straightforward replacement for 21" tires — especially mechanics, casual trail riders, and frequent off-roaders who appreciate robust valve stems and a thicker rubber wall for better puncture resistance. If you own a compatible Honda, Kawasaki, Suzuki, Yamaha or similar bike and want an affordable 2-pack of quality tubes that are easy to install and maintain, this set fits that need without unnecessary complexity.