Originally Posted By: CapriRacer
Be careful here. The rubber on the inside is a usually a halobutyl which not only has good air retention properties, but also has different age deterioration properties than the rubber on the outside.
I know, I know. You're asking why don't they use that type of rubber everywhere in a tire? 1) because it is expensive, and 2) because you can't get the right properties out of that type of rubber.
Interesting to know, but I certainly would understand why different compounds are in different components of the tires. But, I believe my point still stands. The outside is subject to a different environment, particularly when it comes to UV exposure. With respect to the insides, what are we worried about with "normal" air? It's not like we're filling the things with ozone. The humidity is an issue but there is usually some moisture introduced with mounting, regardless of whether or not nitrogen or compressed air was used. In my experience, wheel corrosion has been localized at the beads.
Be careful here. The rubber on the inside is a usually a halobutyl which not only has good air retention properties, but also has different age deterioration properties than the rubber on the outside.
I know, I know. You're asking why don't they use that type of rubber everywhere in a tire? 1) because it is expensive, and 2) because you can't get the right properties out of that type of rubber.
Interesting to know, but I certainly would understand why different compounds are in different components of the tires. But, I believe my point still stands. The outside is subject to a different environment, particularly when it comes to UV exposure. With respect to the insides, what are we worried about with "normal" air? It's not like we're filling the things with ozone. The humidity is an issue but there is usually some moisture introduced with mounting, regardless of whether or not nitrogen or compressed air was used. In my experience, wheel corrosion has been localized at the beads.