[Versatile Compatibility with Multiple Styles]: Our 20-4.0 heavy-duty bicycle fat inner tube is compatible with various 20-inch vintage bike models. This inner tube is also suitable for gravel bikes, mountain bikes, electric bikes, and city bikes, offering a seamless fit and excellent functionality
[High-toughness butyl rubber material]: It is puncture-resistant, resistant to aging, and has strong airtightness. After inflation, it can maintain stable tire pressure for a long time, eliminating the need for frequent air inflation. It is suitable for various scenarios such as daily commuting and outdoor cycling
[Excellent cushioning performance]: This heavy-duty inner tube is made of high-toughness butyl rubber. We have thickened the inner wall and reinforced the valve to maintain high air tightness, greatly reducing the frequency of inflation. Good air tightness helps maintain stable tire pressure, thereby improving driving safety and comfort
[Convenient Installation]: Please check the position of the valve when installing to ensure the correct installation direction. The soft material can be bent into the size of the palm, and can be equipped in the riding bag, making it convenient to replace in case of a flat tire during riding
[Installation Inspection]: Before installation, check whether the inner tube is damaged. You can place the inner tube in water and observe for any bubbles. If there are bubbles, it indicates that the inner tube is damaged, and you can contact us