Pirelli Heavy Duty Front Inner Tube 3.00-21 / 80/100-21 / 90/90-21 Pirelli inner tubes are a good heavy duty inner tube. Available in a multitude of sizes.

Pirelli Standard Rear Inner Tube 90/100-14 Pirelli inner tubes are a good heavy duty inner tube. Available in a multitude of sizes.

Pirelli Standard Rear Inner Tube 90/100-16 Pirelli inner tubes are a good heavy duty inner tube. Available in a multitude of sizes.

Pirelli Standard Rear Inner Tube 110/90-19 Pirelli inner tubes are a good heavy duty inner tube. Available in a multitude of sizes.

Pirelli Standard Rear Inner Tube 80/100-12 Pirelli inner tubes are a good heavy duty inner tube. Available in a multitude of sizes.

Michelin Ultra Heavy Duty Front Inner Tube 90/90-21 90/90-21" TR4 Valve 4.00mm Thick Fits Rear 80/100-21" and 90/90-21" Tyres.