Inner tubes fall into two different types: latex and butyl. Butyl tubes are the default choice for most of us and are fitted as standard on most bikes. Butyl tubes are made from synthetic black rubber, while latex tubes are made from the sap obtained from rubber trees. This rubber is far more fragile than butyl and owing to more time-consuming production, latex tubes are more expensive too. Butyl tubes work fine, so why would you choose to go latex? In a word, speed.
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I've chosen the GPS II to test a latex inner tube simply because it's the fastest road bike tire I had the chance to test up to now. Why a Michelin latex tube instead of some other brand? Because it's the cheapest and best available latex tube. If you're purely interested in the differences between butyl and latex tubes, I recommend you to also read this special article which includes latex,butyl and light butyl tubes.