AR-PRO 80/100-12 Dirt Bike Inner Tubes (2-Pack) — TR4 Straight Valve, Heavy-Duty Rubber for 2.75/3.00x12 Tires

These AR-PRO 80/100-12 inner tubes (2-pack) are heavy-duty replacement tubes with TR4 straight valves designed to fit 2.75–3.00x12 dirt bike tires for reliable off-road and trail use.

If you ride small-displacement dirt bikes or pit bikes, choosing the correct inner tube is essential for predictable handling and fewer roadside fixes. AR-PRO’s two-pack of 80/100-12 inner tubes matches common 12-inch rear tire sizes and comes with a straight TR4 valve stem. The tubes are molded from thicker natural rubber for improved puncture resistance and shock absorption compared with thinner, economy tubes.

How do these inner tubes fit my bike and tires?

These tubes are sized for 80/100-12 tires and are compatible with tires listed as 2.75-12 or 3.00-12. They are intended for 12-inch rims on small motocross, trail, and pit bikes. Check your current tube size or your tire sidewall to confirm compatibility before purchase.

• Size: labeled 80/100-12 to match 2.75–3.00x12 tires
• Valve: TR4 straight valve stem standard for many small dirt bike rear wheels
• Rim diameter: fits 12-inch rims commonly used on 70–125cc class bikes
• Common models: compatible with Honda CRF70F/XR70 (rear), Yamaha TTR90 (rear), PW80 (rear), and similar bikes

What makes these tubes more durable than basic replacements?

AR-PRO uses thicker natural rubber to improve puncture resistance and to help dampen impacts from rocks, roots, and track chatter. The heavier construction also helps the tube hold shape under load, which can deliver steadier handling and a more comfortable ride. While not puncture-proof, the material choice increases service life under typical trail conditions.

• Material: thicker natural rubber for improved tear resistance
• Shock absorption: reduced vibration for smoother ride feel
• Self-sealing behavior: rubber can close around small punctures to slow air loss
• Pack: sold as a 2-pack for having a spare on hand

How do I install and care for these TR4 valve inner tubes?

When installing, inflate the tube just enough to give it shape before seating it inside the tire to avoid pinching. Make sure the tire bead sits evenly around the rim and avoid sharp tools that can nick the tube. Regularly check tire pressure and inspect for embedded debris to extend tube life.

• Pre-inflate slightly to prevent twists during installation
• Avoid metal tire levers or sharp tools near the tube
• Seat tire beads evenly on both sides of rim before full inflation
• Carry a spare tube and a basic repair kit for trail-side fixes

Who is this for? Riders of small dirt bikes, youth motocross bikes, pit bikes, and anyone who needs a reliable rear inner tube for 12-inch rims will benefit from this AR-PRO two-pack. It’s a practical choice for owners of 70–125cc machines who want a thicker, more resilient tube than economy options offer, and for riders who prefer keeping a spare tube ready for trail days, practice sessions, or weekend rides. If your bike specifies a 2.75–3.00×12 tire with a straight TR4 valve, this set provides direct replacements optimized for off-road use without complicated fitment choices.