PIVOTRAX 90/100-16 (3.25/3.50-16) Heavy-Duty 2mm Butyl Inner Tube with TR4 Metal Valve for 16" Mini Dirt Bikes

PIVOTRAX 90/100-16 (3.25/3.50-16) is a reinforced 2mm butyl inner tube with a heavy-duty TR4 straight metal valve built to replace worn tubes on 16" mini dirt bike tires.

When you need a dependable replacement tube for motocross, trail riding, or pit-bike practice, this PIVOTRAX inner tube delivers thicker butyl construction and a rugged valve stem engineered to resist punctures, bending, and air loss. It’s sized for 90/100-16 and 3.25/3.50-16 tires and designed to fit common models such as Honda CRF150R Expert (Big Wheel), CRF150F, Coolster QG-216, Baja DR125/150, and many other 16-inch pit bikes.

How does the thicker 2mm butyl rubber improve durability?

The 2mm reinforced butyl compound increases tear resistance and better absorbs impacts from rocks, roots, and jumps compared with thinner tubes. Thicker walls slow puncture progression and help maintain inflation under punishing off-road use.

• 2mm wall thickness for improved resistance to pinches and punctures
• Butyl rubber retains air longer than natural rubber alternatives
• Reinforced material helps dampen trail vibrations and impacts

Will the TR4 straight metal valve hold up during frequent tire work?

The heavy-duty TR4 straight valve stem is built for repeated inflation, PSI changes, and mounting/demounting operations. Its seamless metal design reduces the chance of leaks and resists bending when using compressors or hand pumps.

• Metal TR4 valve resists bending during tire changes
• Seamless stem construction minimizes air leaks
• Compatible with standard valve caps and tire gauges

Which bikes and tire sizes does this tube fit?

This inner tube is sized specifically for 90/100-16 and 3.25/3.50-16 tires, making it a direct replacement for many 16-inch mini and small-displacement dirt bikes. Check your tire sidewall and owner’s manual to confirm compatibility before ordering.

• Designed for 90/100-16 and 3.25/3.50-16 tire profiles
• Common fits: Honda CRF150R Expert (Big Wheel), CRF150F
• Also fits select Coolster, Baja, and other pit bikes with 16" wheels

How does this tube perform in different riding conditions?

PIVOTRAX engineered the tube to work reliably across varied terrain and weather. The butyl compound and reinforced valve help maintain pressure and reduce flats whether you’re trail riding, racing, or commuting on rough roads.

• Stable air retention in hot or cold temperatures
• Puncture-resistant design for off-road conditions
• Suitable for motocross, enduro, and casual trail use

Who is this for: Riders and mechanics who need a rugged, low-maintenance inner tube for 16" mini dirt bike tires—particularly owners of small CRF-series bikes, pit bikes, and similar models. Choose this tube if you want stronger puncture resistance, a reliable metal TR4 valve stem, and a straightforward, compatible replacement for frequent off-road use. Install using standard tire tools and verify tire size markings to ensure the correct fit.