Chaoyang 20 × 4.0/4.9 inner tube for ENGWE Engine Pro electric bike

Chaoyang inner tube for widths from 4.0 to 4.9

The Chaoyang 20 × 4.0/4.9 is an inner tube for compatible wide 20-inch tires. The black rubber design features a straight valve approximately 32 mm long.

Features and fitment

• Model: ENGWE Engine Pro.
• Chaoyang 20 × 4.0/4.9; straight valve approximately 32 mm.

Approximate dimensions

• Outer diameter of inner tube: 550 mm.
• Inner diameter of inner tube: 400 mm.
• Inner tube width: 60 mm.
• Straight valve length: 32 mm.

The 4.0/4.9 range indicates the tire widths for which it is intended. Please also check the valve type and height; after installation, it must be accessible for a pump and straight relative to the rim hole.

Changing without pinching the inner tube

• Before changing, look for the cause of the puncture in the tire or on the rim. A foreign object, sharp edge, or damaged rim tape can immediately damage the new inner tube as well.
• Inflate the inner tube slightly, align the valve with the hole, and distribute it evenly inside the tire. When installing the bead, do not pinch it with mounting tools.
• Inflate to the pressure allowed for the wheel assembly. Check the position of the valve and the seal; do not use the valve cap to stop leaks.