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I'm no pro but I'll wade in on this having had some limited experience with used tyres vs new.

In my example I'm comparing VERY old RE55s 235 R17s that only had a few mm above the tread indicators left and had been heat cycled MANY times to brand new RS-Rs, which aren't an R-Comp.

The RS-Rs have gone a touch faster, despite not being a proper R-Comp but that could also be down to improvements in the car and driving, the improvement is less than 1sec.

That said, the second hand, used up, never ever use these (I was told) RE55s that cost me $200 were awesome to learn on and had a ton of grip and having been heat cycled a few times which hardens the compound, lasted better than I thought they would, I did 5 or so events on those.

I've read heaps about the tyre rejuvenator stuff as well which seems to help to some extent to if outright grip is the goal.

As Duncan said, for general track days, testing the car, bedding in parts, etc I think you'll be fine (so long as the price reflects the age, no point paying brand new prices for old stock just as a matter of principle).

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