Chaoyang 20 × 4.0/4.9 inner tube for ENGWE EP-2 Boost electric bike

Chaoyang inner tube for widths from 4.0 to 4.9

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

Features and fitment

• Model: ENGWE EP-2 Boost.
• Chaoyang 20 × 4.0/4.9; straight valve approx. 32 mm.

Approximate dimensions

• Outer diameter of the inner tube: 550 mm.
• Inner diameter of the 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. Also, check the type and height of the valve; after installation, it must be accessible for the pump and straight relative to the rim opening.

Replacement without pinching the inner tube

• Before replacement, 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 opening, and distribute it evenly inside the tire. When seating the edge, do not pinch it with mounting tools.
• Fill to the pressure allowed for the wheel assembly. Check the valve position and sealing; do not use the valve cap to stop leaks.