Originally Posted by
koala logs
The fluctuating heat alone can damage the rubber and plastic parts even if there is absolutely no UV exposure
I doubt temperature is going to degrade rubber or plastic on a bicycle by any significant amount.
Consider a car’s passenger compartment, filled with rubber and plastic components, sitting for thousands of hours in the sun over its lifetime. It gets quite hot in the passenger compartment, yet the parts don’t fall apart. The dashboard may crack, but I submit that’s due to UV from direct sunlight, not high temperature.