IRC Components motorcycle inner tube 170/80-15 PV-78 — 15in rim, natural-butyl blend for reliable air retention

IRC Motorcycle TUBE 170/80-15 PV-78 is a replacement inner tube engineered in Japan to meet or exceed OEM standards for fit, durability, and air retention.

This 170/80-15 PV-78 inner tube from IRC Components combines natural and butyl rubber for a balance of elasticity and puncture resistance, designed for compatibility with many 15-inch motorcycle rims and tires. Built to Japanese manufacturing tolerances, the tube delivers consistent inflation, predictable pressure behavior, and reliable sealing around the valve stem. It’s a straightforward, high-quality spare or service part when you want a dependable inner tube that matches original equipment performance.

Which bikes and rims will the 170/80-15 PV-78 tube fit?

The tube size 170/80-15 indicates it fits tires with a 170 mm width and an aspect ratio of 80 on a 15-inch rim. This makes it suitable for motorcycles and scooters that specify that nominal tire dimension and require a PV-78 valve specification. Always check your tire sidewall or owner's manual for the recommended inner tube size before purchasing.

• Designed for 15-inch rims with 170/80 tire sizing
• Compatible where a PV-78 valve is specified
• Suited to many Japanese and international motorcycle models using tube-type tires

How does the IRC tube balance elasticity and puncture resistance?

IRC formulates this tube from a blend of natural rubber and butyl rubber to combine the stretch and sealing advantages of natural rubber with the air retention and chemical resistance of butyl. The resulting material provides good conformity inside the tire and reduced permeability compared with pure natural rubber tubes, helping maintain pressure over longer service intervals.

• Natural rubber adds flexibility for easier mounting and better tire seating
• Butyl improves airtightness and resistance to gradual leaks
• Manufactured to Japanese quality controls for consistent wall thickness and strength

What should I expect when installing or maintaining this inner tube?

Installation follows standard inner tube procedures: partially inflate to remove folds, position inside the tire, seat both bead edges on the rim, then fully inflate to the recommended psi. Use proper tire levers and avoid sharp tools; inspect the tire interior and rim strip for debris to prevent punctures. Check valve orientation and torque (if applicable) when fitting a valve nut.

• Pre-inflate slightly to reduce pinching during installation
• Inspect tire and rim for sharp objects or burrs before mounting
• Follow the motorcycle maker’s recommended tire pressure after installation

How long can I expect this tube to last, and how should I store spares?

Service life depends on riding conditions, maintenance, and exposure to heat, ozone, and sunlight. Properly installed and maintained, a quality tube like the IRC PV-78 will serve for many riding seasons, but it should be replaced if it develops leaks, visible cracks, or thinning. Store unused tubes in a cool, dry place away from direct sunlight and ozone sources (e.g., electric motors) to preserve rubber elasticity.

• Store spares in cool, dark, dry conditions away from chemicals
• Periodic pressure checks help spot slow leaks early
• Replace if rubber shows cracking, hardening, or permanent deformation

Who is this for: Riders, mechanics, and parts suppliers looking for a reliable, OEM-quality replacement inner tube for 15-inch motorcycle tires will find the IRC 170/80-15 PV-78 a practical choice. It’s aimed at anyone who needs a dependable spare for road use, routine service work, or fleet maintenance where consistent performance and Japanese-built quality are priorities.