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

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

This Chaoyang inner tube is specifically designed for electric bicycles requiring a 20-inch diameter tube compatible with tire widths ranging from 4.0 to 4.9 inches. It is a direct replacement part for the Engwe EP-2 Boost electric bicycle, ensuring a suitable fit and function.

Key Features and Compatibility

• Exact Fit: Designed for tires with a nominal diameter of 20 inches and a width range of 4.0 to 4.9 inches.
• Vehicle Specific: Confirmed compatibility as a spare part for the Engwe EP-2 Boost electric bicycle.
• Valve Type: Features a Schrader valve (also known as an American valve), which is 32mm in length.
• Dimensions: The inner tube has an approximate outer diameter of 550mm and an inner diameter of 400mm when uninflated. The tube width is approximately 60mm.
• Weight: The net weight of the inner tube is approximately 0.38 kg.

Choosing the Correct Inner Tube

To ensure you select the correct inner tube, always verify the dimensions marked on the sidewall of your existing tire. Look for markings such as "20 x 4.0" or "20 x 4.9". Additionally, confirm that your rim's valve hole is compatible with a Schrader valve and that the valve length of 32mm is appropriate for your rim depth.

Installation and Safety Guidance

When installing the inner tube, ensure the tire is fully deflated and carefully remove it from the rim. Partially inflate the new inner tube to give it shape before inserting it into the tire casing. This helps prevent pinching the tube between the tire bead and the rim during installation. Once the tire is seated on the rim, inflate it gradually, checking that the tire bead is evenly seated around the entire rim on both sides. Always refer to your tire's sidewall for recommended inflation pressure ranges and do not exceed the maximum pressure. After installation, perform a visual check for any bulges or uneven seating before riding.