Chaoyang 20 × 4.0/4.9 inner tube for ENGWE EP-2 3.0 Boost 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 corresponding wide 20-inch tires. The black rubber design features a straight valve approximately 32 mm long.

Features and fitment

• Model: ENGWE EP-2 3.0 Boost.
• 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.
• Width of inner tube: 60 mm.
• Length of straight valve: 32 mm.

The 4.0/4.9 range indicates the tire widths for which it is intended. Also, check the valve type and length; once installed, it must be accessible for the pump and straight relative to the rim opening.

Replacement without pinching the tube

• Before replacing, check the tire and rim for the cause of the puncture. Debris, sharp edges, or damaged rim tape can immediately damage the new inner tube as well.
• Inflate the tube slightly, align the valve with the opening, and distribute it evenly inside the tire. When installing the tire bead, be careful not to pinch it with mounting tools.
• Inflate to the pressure allowed for the wheel assembly. Check the valve position and for any leaks; do not use the valve cap to stop a leak.