18x5.5 Tubes

[JimC]

I had an 18x5.5 fail a few days ago with sidewall deterioration just like you've described. I landed normally, taxied to fuel, and filled my tanks. When I went to taxi away I found the flat tire.

It was very fortunate that I had a spare tube - even though it's the same brand. I'm ordering more spares even though I know they'll fail. I saw your note to Aircraft Spruce - have you contacted the manufacturer directly?