Tires: Butyl....or natural rubber?, natural rubber, charlie charlie

Question
Hi Barry,
I need to run tubes in my motorcycle because it is an old classic and has rather porous cast rims. I'm curious to know which is safer....butyl or natural rubber? I think butyl holds air better but don't understand any more than that. Thanks for any information, suggestions or advice you can offer!

Charlie

Answer
Charlie,

Butyl does hold air better - for the same thickness - but natural rubber is so much easier to work with, so it is cheaper and made thicker.

From the perspective of buying, you will not be able to tell the difference.  Buy on price and country of origin.  Obviously more expensive is probably better quality.