For whatever reason (design, maintenance, type of riding) wear has been minimal. That’s what suggests mere passage of time in combination with possible environmental factors.
I had a lowly KLR sitting in my garage for an embarrassing length of time. One day, without warning, the fuel hose (vacuum petcock) started dribbling gasoline all over the floor. Maybe it was ethanol in the gas, maybe ozone or solvent vapors—who knows? Point is, rubber doesn’t last forever even in the absence of physical wear and tear….which I think is what you’re saying.
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