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20 x 3.5-20 x 4.0 bicycle tube: compatible 90/100-406 bicycle tyres 20 inch 20 x 3.5 20 x 3.6 20 x 3.7 20 x 3.8 20 x 3.9 20 x 4.0 with 32 mm Schrader valve, fits most roads. and mountain bikes. It is ideal for mountain bikes, road bikes, enduros, electric bicycles. Note: Please check your tyre size before purchasing. The respective tyre size is easy to read from the bicycle tyre sidewall. High-quality butyl rubber: the 20 x 3.50 20 x 4.0 bicycle tube is made of 100% butyl rubber connection, ideal as a replacement for 20 inch bicycle tubes. It provides a better seal and can hold the air for a long time without the need to re-pump often. Environmentally friendly, non-toxic, non-corrosive and non-hazardous, non-flammable, water-soluble. More durable: 20 inch hoses have undergone strict quality and test inspections and are durable. 20 inch bicycle tyre tubes can be used as replacement hoses to avoid the embarrassment of not being able to ride after a hose burst. Do it yourself and you save more money than in your local store! Easy to install: the installation of the bicycle tube is very simple. Follow the steps and you can remove the tube from the tyre in minutes and install a new hose. Perfect after-sales service: If you have any questions and dissatisfaction, we will solve your concern within 24 hours. Tip: the hose is wrapped in plastic film. Avoid using sharp tools to prevent tools from cutting through the hose. › See more product details; Product description Customer service: Please do not hesitate to ask us for help. Our team is ready to help you with any questions or concerns.; Product description Customer service: Please do not hesitate to ask us for help. Our team is ready to help you with any questions or concerns.; Customer service: Please do not hesitate to ask us for help. Our team is ready to help you with any questions or concerns.