Quote:
Originally Posted by speeder
Thanks. I would definitely expect them to say this since they are in the business of selling tubes and as a CYA statement but it’s good advice, especially if you do not know the age of the old tube.
I’m definitely not changing the tubes on the BMW, (I installed them new in 2017, top quality tubes), and I’m replacing the front one on the Triumph but the rear was back ordered. I guess that the front is more important but a rear blow-out at speed would suck as well. I’m going to err on the side of caution but I’m like an annoying little kid...I always want to know WHY? 
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I would bet the natural rubber still breaks down, though not as quickly as the rubber exposed to the sun. I know with tires they stay in better shape if used as it keeps the conditioners worked in. Unless they don't have conditioners like a race tire. At least that is what the tire guy told me.