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The tyres on my 500 are over 40 years old, Pirelli Phantoms, anyone remember them? TBH I haven't ridden it for over 40 years and I'll replace them soon when the wheels get done. Wish they still did the Phantoms, great tyre.
If its been fitted and in sunlight for that time no, if its been stored in the dark yes
My old 400/4 front tyre developed a "flat" that went round with the wheel turning after 20 years storage!