I demounted some older Pasela's and found a crack in the sidewall that
ran around the entire sidewall at the point where the sidewall touches
the rim, maybe a mm. or two from the edge of the bead.  I never would
have detected it if I had not taken the tires off.  The black tread
was still in excellent condition, but I had to throw them away.  My
suspicion is that the deterioration of the sidewall is not due to
usage or wear but to degradation from ultraviolet rays and/or ozone.
I'm going to inspect my Jack Browns today for the same problem.
>
> FWIW, I have a few nicks in my tan Pasela sidewalls from rocks or such, but
> not cracking or deterioration on them.  I'm keeping my on those few areas as
> the top weave is cut, but the second layer is still fine.  Hope it stays
> that way as I have a bit of tread still (but going fast!).  They do seem
> really "dry" though, almost brittle.
>

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