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How far would you run these tires for track use?

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These are the original front tires from my 2017 GT350. They are down to the wear bars and the shoulders are worn down. I am having them replaced tomorrow but for future reference I'd like to know if they can safely be run longer on track or is now the right time?
 

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If you're trailering they'll be fine in the dry. How many heat cycles do you have on them? I know high treadwear street tires aren't supposed to heat cycle out but if you've got 30 heat cycles or six track days on them I suspect their grip is less than desired.
 

Bill Pemberton

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VoodooBoss has a solid added note, as I have a tendency to assume folks are trailering their car as I do, when in reality there are tons of guys that do not - and I drove to the track for many, many years.
 
The tires had at least 50 heat cycles in them over at least a dozen track days. Last time out it was almost 100 degrees and pretty sketchy. Now I'm thinking I should have replaced the rears too.

I don't trailer the car unless I go out of state and I'm fortunate to live only 15 minutes from the track so I just drive the car.
 

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