If you replace RE71R when wear gets to the indicators, you're getting less than half the useful life out of them. I would also be at the indicators after 4 track days, but when I kept running them on the BRZ while Porsche was in the shop last year, I got 6 more track days out of them and didn't reach the cords or lose much if anything in terms of grip due to heat cycles.

I'll snap some pics later, but my rear tread is almost gone. The fronts have a fraction more, so if I swapped to the rear I have maybe another half day on them. UNLESS you can run them with zero tread depth left.

I've had a couple friends order autocross compounds through JB and seemed to be pleased. I'll ask around to see if there's any that pop up. I know I can get some 255 40 17 Gforce 1s for cheap, but not sure those are worth snatching up over spending a little more for the r7s.

I'd say this is the replacement mark;
https://lh3.googleusercontent.com/3x...-no?authuser=0

We've run them down to this;

https://lh3.googleusercontent.com/Tq...-no?authuser=0


They get edgier, much harder to get 10/10ths out of them, but they still feel like they have grip to my butt dyno.

My rears are right about the same as yours above except my shoulders are even. Fronts have a smidge more depth, but I'll double check this evening.

You can run them with zero tread depth left...

If you were autoxing I'd say another event day or two depending on conditions via swapping, but assuming your TT offers HPDE levels of seat time (1-2 hours per day) fresh tires are relatively cheap.

You need more camber!
You probably should have flipped them before it came to this...

On my BRZ with -3.3 front -2.6 rear camber I never flipped them, just rotated every event. I ran them as "slicks" for at least 3 track days. Never showed cord.

Has anyone run the Falken rt660 yet?

I'm not honestly sure where I was at for that set of tires, I'm on -4.3°F and -2.3°R right now, will probably bump the rear up a bit and reduce the front a touch since I'm getting some inner camber wear along and I'll try a bit of toe out.

:cheers:

Interestingly I ran my rear tires like that at my last track day but with inner camber wear instead of outer. The tires (RS3's) felt the exact opposite. Loose but easy to catch in corners. Never felt like they had any real grip especially on throttle.

Different rubbers and construction, not surprising they act different as they age.

I hear BFG's for example feel exactly the same, they just have less grip.

Yeah good point. I wouldn't be surprised if it had more to do with construction/compound vs. wear pattern.

Is the consensus basically that tread depth has zero correlation to dry grip?

Depends on the tire, some have layered compounds and along with the age/heat cycle changes of the compound you may hit a point where you've used up all the sticky stuff before the grooves are gone.