My name is Terry, and I'm a hoarder.
My main bike has Dura-Ace 10-speed (mechanical). I hoarded Dura-Ace chains and cassettes for as long as I could find them, but those are long gone. Now I am hoarding Ultegra chains and cassettes. I found some Dura-Ace OEM hoods for the levers at a local shop, so those are tucked away.
I don't bother with derailleurs, as they last forever. But if one of the levers goes bad, I am screwed.
If anyone tells you that obsolete group set components are easy to find as new old stock, they are shameful liars.
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Ride, Rest, Repeat. ROUVY:
terrymorse