Originally Posted by
Tycho Brahe
Ironically, I was thinking of switching over to Pro4 Endurance from Continental 4000S IIs due to poor sidewalls. According to
https://www.bicyclerollingresistance.com/ the Michelins have much better puncture resistance, especially in the sidewall.
My bike gets ridden a lot, so I am not sure if the sidewall rot is related to distance or simply time. I will go through a tire in well less than a year.
I have seen the dry rot that the OP mentioned, but it was only on my commuter bike that got about 40-50 miles of use per week. My road bike gets about 300 miles per week, and the tire wears out long before any dry-rot can occur.
I continued to use the tire until the threads began to appear, without any issues.