Chaoyang Inner Tube 20 x 4.0/4.9 for Engwe EP-2 Pro Electric Bicycle

Chaoyang Inner Tube 20 x 4.0/4.9 for Engwe EP-2 Pro Electric Bicycle

This Chaoyang inner tube is specifically designed for electric bicycles, offering a direct replacement for the Engwe EP-2 Pro model. It is sized for 20-inch wheels and is compatible with tyres ranging from 4.0 to 4.9 inches in width.

Key Features and Compatibility

• Exact Fit: Designed as a suitable replacement for the Engwe EP-2 Pro electric bicycle.
• Dimensions: This inner tube measures 20 inches in diameter and is compatible with tyre widths between 4.0 and 4.9 inches. The outer diameter is approximately 550mm, with an inner diameter of about 400mm.
• Valve Type: Features a Schrader valve (also known as an American valve), which is 32mm in length.
• Material: Constructed from rubber material.
• Weight: The net weight of the inner tube is approximately 0.38 kg.

Choosing the Correct Inner Tube

To ensure correct fitment, always verify the dimensions marked on the sidewall of your existing tyre. While this inner tube is specified for 20 x 4.0/4.9 tyres, checking your tyre's exact markings is crucial. Also, confirm that your wheel rim is designed for a Schrader valve and that the valve hole accommodates the 32mm valve length.

Installation and Safety Guidance

When installing the inner tube, ensure the tyre is fully deflated. Carefully insert the valve through the rim hole and secure it with the nut. Partially inflate the tube to give it shape before seating the tyre beads evenly on the rim. Before full inflation, check for any pinching of the inner tube between the tyre bead and the rim. Inflate to the pressure recommended by your tyre manufacturer, typically found on the tyre sidewall. After installation, inspect both sides of the tyre to confirm it is properly seated on the rim.