What is the substance inside my bike's inner tube?

  • Thread starter Thread starter klausadave
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klausadave

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I got a flat and this white-yellow substance oozed out. It looked very much like mucus, and some dried on my tire and became white filmy/flaky. Is this normal?
It may be that slime...I got the thing from a bike coop. But I can't blame that for the flat - there are some traffic-heavy areas where I can't avoid a very rocky path, dangerous with road bike tires.
 
you probably got it filled with "slime" by the store - that's supposed to fix small punctures. looks like yours was not small enough.
 
During manufacturer, the inside of the tube is dusted with talc or similar to stop the sides sticking together.

Moisture in the air during tube inflation condenses and forms paste. This is what you have found.
 
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