For many years, I've heard older people say that inner tubes don't hold air as well as they used to. It's usually the same thing - 'I never had to air up my tires when I was a kid.' Others seem to think that tubes puncture easier now than they did even 15 or 20 years ago. All of this got me wondering if there really is a difference between the quality of tubes and if it's changed through the years. First, a (very) short history: Originally tires and tubes were made from natural rubber from the Hevea tree that is grown almost exclusively in Indonesia and Malaya. During World War II, Japan had invaded these countries and cut off the world’s supply of natural rubber. This led to a shortage and the need for an alternative. At the time, German engineers had already been working on a synthetic rubber, but it wasn't until 1942 that U.S. engineers were able to develop it into a useable rubber compound called Butyl. Butyl synthetic rubber...
The Bike Hive - Indy Professional Bicycle Mechanic