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In STX trim, my first set of Yoks is at 160 runs, plus a few thousand street miles including Deals Gap runs. I don't know how many runs they have left, but I'm thinking 20-40. They fell off around half that number, but that is also the point where I left them outside all winter (thinking I could easily get a new set the start of this year).
I'm also of the opinion that pretty much every tire falls off somewhere around 80 runs/4 month time period. I probably got less competitive runs out of RE71R's than any other tire that I've owned, because it took a bunch of runs for them to come in.
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