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[MerrilGordon]

Anyone have a feel for how much grip tire rubber looses as they age?
It's pretty substantial on some old snow tires I have. Not near the traction.
I've been using some older highway tires lately that I took off a Verde I parted out and believe they've seen better days as well, even though there is good tread left. These are nice Dunlop SP8000 or 9000 or something like that.

Merril

[Micke]

Depends on rubber compound. There's no clear rule but most tires start to suffer after 2-4 years.

[MerrilGordon]

Thanks Micke.

And to continue with the question; There's quite a selection of track tires available. So if track tires arn't used up within a year, then they'd better be used up by end of year two or they will also get harder and loose their effectiveness.

Thanks,
Merril