How much rubber is left once the tread is gone?

Do these tires have another track day in them?

Any ideas?

 

those tires are just getting interesting.....now they are almost slicks...run them until there are sparks flying off of the wires

 

Ouuu, just barely I'd say. I would have to guess that at this point the tires have been heat cycled many times and might not have the stick they once did. They will get you through a couple of sessions I'd say but if you are doing a full day you might end up with cords showing.
If there is a guy on site to change tires (many tracks will have someone there) then use them until they are finished (keep checking them after every session!) and toss on new buns when you need to.
If not and you risk not being able to lap, install new one's.
Chris

 

That is my idea. ... but I know from my Turbo that at some point they start to loose air and go flat in a minute.

On the 997 there is a tire pressure monitor so I'll have some warning when the leaking starts. However, I don't want to have to leave during a track day and buy new tires. They may also not be available in remote locations.

 

seriously, there is no reason to cut your next track day short when it fails after the first run...might as well mount up a set of freshies and be done with it

 

I agree about the heat cycle issue. My last track session was a bit frustrating because though I had enough rubber to make it through the weekend, the tires were not sticking like they should have. To compound the problem the rears were the ones with the most heat cycles and I was loose, loose, loose and ended up spinning, spinning, spinning when I pushed the car even a little bit. Four new tires for me at the next track event.

 

if you're trailering your car, and have spares on hand, I'd run them a few sessions before giving up on them.

if not- and you're like me and mooty which is to say you're driving over 120 miles roundtrip in your car, on those tires to get there and back...err on the safe side and switch them out.

what cold/hot temps are you seeing? how much neg camber are you running?

 

trailer or not, the tires are gone.
you have enough tread, but heat cycled out.

 

mooty would know- he and bobby C have probably gone through at least 10 sets of tires in the past year...

 

If you're wearing out the insides you have too much neg camber for the car, you style of driving, or the track you're using. Get ahold of a tire pyrometer and take some hot temps across the tire. That will tell you.

 

Those are some awesome looking tires..........

Almost ready for drifting

 

How do you know they are heat cycled out? I run my Sport cups on my M3 until they cord and I never see the traction reduce on them. I stop using them only when they cord. I agree with the thoughts about getting to and from the track and if not trailed, then he will need to get them changed at the track which could be a problem.

 

 

based on my own experience.
15 heat cycles, i no longer get the same grip from mpsc.

are you the red GT3 with a very large muffler/turndown OUTSIDE of the rear bumper at laguna seca 2 weeks ago? if so, did you pass sound?

 

Stop fooling around...replace them, they are shot

I'm impressed, so clean, with no pick-up at all