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centrally worn tyres are absolutely fine if you want a faster rolling tyre that still corners well. (albeit more drift happy when transitioning over into the turns).
surely you know yourself if it's lacking grip for your own personal use, trails and riding style.
Like Gary says when you loose confidence in the tyre, then its time to change. I often find that in the summer months I love a tyre that is almost on its way out, as it rolls fast, still grips enough, but can also move around in a predictable way.
But then again I love doing skids, to the detriment of all proper riding technique!
SKIDZ are AWESOME and are definitely a skill you need to employ from time to time while still executing correct (proper) riding technique.
Mastering skids is a fundamental skill.
"skids are for kids" and "ride don't slide" cliche sheep crowd are rarely very good riders and it's partly because they don't actually know how to skid properly.
Skids teach dynamic weight distribution and body positioning and increase a riders ability to calibrate grip quickly using fine adjustments. eventually becoming controlled by muscle memory exceuted entirely on feel.
If you don't enjoy the feeling of tyres sliding (brakes or no brakes) you're missing out big time in my book.
anyway.. those tyres are prime for learning skids, cutties and drifts.
I have over 4,000 miles on a Vittoria Zaffiro Pro trainer tire (purchased in 2014) mounted on a cheap spare wheel that has been used on a Kurt Kinetic and now a Kickr Snap (for past 3 years). Tire inflated to 110psi and 2 full turns of the knob after the tire makes contact with the drum.
Occasionally I’ll wipe down the tire and the trainer drum with a Clorox wipe to get any dirt and grease off and I’ve never had an issue with slippage.
Of course, no slippage may speak more to my lack of explosive power than the quality of the tire.
That tyre is woen ro the point it has long since failed to perform as designed. As others have said it could be used as a skid practise tyre or even as a faster rolling xc type faster rolling tyre on hard pack but it is not going to provide any grip for braking or climbing or on loose or muddy surfaces.