AR-PRO 2-Pack 80/100-12 Dirt Bike Inner Tubes with TR4 Valve — Heavy-Duty Thick Rubber

These inner tubes are built for small-displacement off-road motorcycles and pit bikes that use 12" rims. Manufactured from thick natural rubber and fitted with TR4 straight valve stems, they replace worn or damaged tubes for a secure, long-lasting ride. The set contains two tubes sized to match common 80/100-12 or 3.00-12 tires and is compatible with many popular models from Honda, Yamaha, Kawasaki and several off-brand bikes.

Which bikes and tire sizes do these tubes fit?

They are sized for 12-inch wheels and specifically match tires listed as 80/100-12, 3.00-12, or 2.75–3.00-12. That makes them suitable for rear wheels on many 70cc–125cc dirt bikes and pit bikes. Always check your existing tire sidewall and rim diameter before ordering to confirm fit.

• Fits tire widths: 2.75" to 3.00" (listed 80/100-12, 3.00-12)
• Rim diameter: 12 inches
• Common compatible models: Honda CRF70F/XR70 (rear), Yamaha TTR90 (rear)
• Also fits: Yamaha PW80 rear, Kawasaki KLX110 rear, Baja/ TaoTao/ Coolster equivalents

How durable are AR-PRO tubes on rough trails?

These tubes use thicker natural rubber to resist punctures and better absorb impacts than thinner replacements. They are engineered to handle the knocks and vibrations of trail riding while reducing the frequency of flats under normal use. The material also helps smooth out small bumps for improved ride comfort.

• Thick natural rubber improves puncture resistance
• Enhanced shock absorption reduces vibration
• Self-sealing properties slow air loss from small punctures
• Heavy-duty construction suited to off-road conditions

What valve type and installation tips should I know?

Each tube features a TR4 straight valve stem that fits standard 12" rims with straight valve holes. During installation, partially inflate the tube to prevent twisting, then seat the tire bead evenly around the rim. Avoid using sharp tools; use tire levers and inspect seating on both sides before full inflation.

• Valve: TR4 straight stem — standard for many small dirt bikes
• Inflate slightly during mounting to avoid pinching or twisting
• Use protective levers; do not force with sharp metal tools
• Check bead seating evenly on both rim sides before full inflation

Do these tubes offer any self-sealing benefit if punctured?

The tubes include self-sealing characteristics that can plug small punctures and slow air loss, giving you extra time to reach a safe service point. This feature is not a guaranteed permanent repair but does add a layer of protection against minor debris-related flats. For larger punctures or sidewall damage, replacement remains necessary.

• Self-seals around small puncture holes to reduce rapid deflation
• Provides temporary protection so you can finish a ride or reach repairs
• Not a substitute for proper patching or tube replacement when heavily damaged
• Recommended to carry spare tubes and basic repair tools on long rides

Who is this for: Riders of small dirt bikes, pit bikes and youth motocross machines who need a robust, plug-and-play inner tube replacement. If you own a 70cc–125cc rear-wheel dirt bike with a 12" rim and 2.75–3.00" tire width, want thicker rubber for better puncture resistance, and prefer tubes with standard TR4 valves, this AR-PRO 2-pack is a practical spare or replacement option.