Butyl and natural rubber tubes differ primarily in their material composition and intended use.
Synthetic rubber tubes manufactured from a copolymer of isoprene and butylene are known as butyl rubber tubes. Because of their well-known ability to retain air, they are far more effective in holding air pressure than regular rubber tubes. Because of this, they are often utilized in high-performance tires, like those for cycling and racing.
Conversely, the sap of rubber trees is used to make natural rubber tubes. They offer a smoother, more comfortable ride and are more elastic than butyl rubber tubes. They are not as airtight as butyl rubber, though, so they eventually lose air pressure and are more vulnerable to punctures.
In conclusion, natural rubber tubes are selected for their suppleness and smooth ride, while butyl rubber tubes are recommended for their ability to retain air.