NT01 Tread wear enough left for full track day?

[Niart906]

I bought a set of used wheels and tires late last year, and since then I've done 4 full track days on them. (7x20min) Searching through old forum posts, it seems that most drivers run their NT01's down to the cords with no real appreciable loss in grip. With that in mind, what are the chances that I can get through another day with these rears? Would it be worth it to flip them, just to have a bit more shoulder on the inside?

I'm currently running staggered Apex EC7's with NT01's 275/35/18 and 305/35/18. I've been really impressed with how they've handled the abuse so far, just not sure if it's worth pushing my luck. I will also have my stock 666M's on PS4S tires with me at the track. So they could be used as backup if/when I cord these Nittos.

[drroc]

It should be fine for one more day. Especially since you have a backup set. Based on the depth of the divots, you have a good amount of rubber left.

[dvas]

I would run those. As you noted, NT01s are good to the chords. But you may not get through a full day, especially if you’re really hard on them on the out lap or get lockups under braking.