Quote:
Originally Posted by jkv45
Anything over 5 years for a cycle tire is considered "old" - no matter how much tread there is or how good the rubber looks.
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I've seen some manufacturers use 10 years as the guideline. For my own use, since I live away from big cities and have low ozone levels in the air, and since I store my motorcycles indoors away from UV light, I don't worry much if I get to the 5 year point.
Ozone is one of the main things that makes tire rubber degrade with time. It's in the air, and around big cities the concentration can get high. Also, UV in sunlight makes ozone from the oxygen in the air, so that's why I mentioned proximity to a big city, and sunlight.