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Last summer I had a serious talk with my tire guy, he is 3rd generation running family Dunlop Tires (cars & trucks, no bikes) sales & service. The issue was my 2011 Chevy Tahoe that I bought slightly used in April, 2012, it had been a rental vehicle for a short while as it only had 15K miles on it. So, last summer I asked my guy Herbie for the truth about replacing as, at that time last summer, the Tahoe tires were 7+ years old but only had 30K miles and the tires looked almost like new.
Herbie said, "Joe, if all your driving was going to be around town I would tell you those tires are still good for lots of miles and maybe another year or two but if you are going to be running interstate speeds I would replace them today. They are old and will start coming apart on you at high speed." Tells me all I need to know about tires LOL.
That is wise advice and in line with my post at #4 above. Some if not all tyre brands may/should have advice on their websites on tyre life and replacement.
All the advice previously given is good advice, and if funds aren't an issue the best course of action. I'd still probably run them, feel it out, see if they slip or feel planted. Most of us never reach the limits of our bikes traction, it's other errors that limit our cornering (and you'll make those errors regardless of tires). But yeah I'd run em at least long enough to know how they felt. And unless I was incredibly tight on funds I'd replace the front when I did the back, now or in a year. Slightly hardening tires are one thing, but significantly mismatched tires are a whole different kinda traction problem.
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