AR-PRO 80/100-12 Dirt Bike Inner Tubes (2-Pack) TR4 Straight Valve — Heavy-Duty, Thick Rubber for 2.75/3.00-12 Tires

These AR-PRO 80/100-12 inner tubes (2-pack) are heavy-duty replacement tubes with TR4 straight valves designed to fit 12" dirt bike rims with 2.75–3.00" tires.

When you need dependable spare inner tubes for trail days, practice laps, or commuting on small-displacement motorcycles, choosing the correct size and valve type matters. AR-PRO's 80/100-12 tubes are made from thick natural rubber, include TR4 straight valve stems, and are supplied as a two-pack so you have a ready replacement for common 12" rear wheels found on 70–125cc bikes.

Will these inner tubes fit my 12" dirt bike tire?

Yes — the AR-PRO 80/100-12 tubes are sized to work with tires labeled 2.75-12 or 3.00-12, which makes them compatible with most 12" rims used on small dirt and pit bikes. Check your tire sidewall and existing tube size to confirm a match before installing.

• Fits tire sizes: 2.75-12 and 3.00-12 (marked 80/100-12)
• Designed for 12-inch rims commonly found on 70–125cc bikes
• Sold as a 2-pack for front/back or spare coverage

How does the TR4 valve perform on trail and street use?

The straight TR4 valve stem is a standard, serviceable valve type for small motorcycle wheels and works easily with common valve caps, pumps, and compressors. It provides reliable airflow control and is straightforward to replace or service if damaged.

• TR4 straight valve for standard pump compatibility
• Easy to access for inflation and pressure checks
• Compatible with typical valve caps and core tools

Are these inner tubes durable enough for off-road riding?

AR-PRO engineers these tubes from thicker natural rubber to increase puncture resistance and cushion impacts, which helps reduce vibration and the risk of pinch flats when riding over rocks, roots, and rough terrain. They also have self-sealing properties that can slow air loss from small punctures.

• Thick natural rubber for improved puncture resistance
• Self-sealing action around minor punctures to retain air
• Good shock absorption for smoother rides on uneven surfaces

What bikes and models are these inner tubes compatible with?

These tubes are specified for a wide range of small motocross and pit bikes, covering many common 70cc–125cc rear wheels. They work with models from major and entry-level brands, making them a versatile spare for riders with different machines.

• Fits Honda CRF70F and XR70 (rear)
• Compatible with Yamaha TTR90 and PW80 (rear)
• Also fits Baja, TaoTao, Kawasaki KLX110, Coolster, and similar pit bikes

Installation tips: avoid sharp tools when fitting the tube, partially inflate before seating the tire to prevent twists, and verify the tire bead is evenly seated around the rim. These steps reduce the chance of pinching or uneven seating that can cause failures.

Who is this for? Riders and mechanics who maintain small-displacement dirt bikes, pit bikes, and youth motocross machines will appreciate having a reliable 2-pack of correctly sized inner tubes. Whether you’re stocking spares for practice, preparing a service kit for a rental fleet, or replacing a worn tube on a weekend trail rig, these AR-PRO tubes offer a practical, heavy-duty option that fits many 12" setups.