You do know that the arrow is there to identify the location of the wear indicators and not a camber alignment guide?

I'm on Falken 615s so they wear pretty good. Traction is a different issue.

Why do you even have a street set of wheels/tires!? You barely drive it!

I don't use them to align camber.

I don't want to drive to cars and coffee on $1000, 100tw tires (I WILL pick up a nail). Also, I occasionally drive to my "local" track which is 110ish mi each way. Again, I will, absolutely pick up debris.
Also, I was 100% lazy and exhausted after an event there, so drove home on the Nittos. So noisy, I pulled over because I thought something was wrong with the car. LOL They did NOT like cement freeways.

I assume you have NT01s. I have them on my bug. I dont think they are loud but it's hard to say since everything else about the car is so loud. They do pick up a ton of rocks though.... awesome tires.

On asphalt they were fine.. just the cement sections, which is from the track until about 20-30mi down the freeway. The tires were whining so bad, I thought my t-case was on it's way out. It was LOUD. My car is also gutted and reverberates everything like a drum, so then there is that But I could hear it over the stereo blaring and through my ear plugs.

You said the tire rolls over to where the arrow points, so its good. That is not what the arrows indicate. The arrows are way off the tread, if the tire is rolling over that far you do not have enough camber.

NT01's are loud as hell at full depth. Whoever says otherwise is hard of hearing.

Here is my car with a fresh set of NT01's. You can literally hear the tires well before you see me in this recording. Sounds like a Tie-Fighter. lol


Another one, about 125mph:

This.

This is kinda what I was getting at with the wear should be to the "edge" the arrow is pointing at, not to the arrow.

I forgot the arrow indicated that's where the tread wear bars are. Old tech info from working at discount tire...lol

And yes, NT01's are load as ****. Louder than any mud terrain or off-road race tire I've had on any of my trucks. Including grooved short course tires.

please excuse my track car ignorance, but aren't you suppose to use a pyrometer on the tires to determine what you should do with your alignment at the track?

That would be ideal. But in the absence of a pyrometer you can also monitor how the tire is wearing. Also, sometimes "ideal" tire temp readings don't make the car handle how you want it. So it's kind of just one "part" of the chassis set up tool kit.

Even a pyrometer is going to lie to you. Watch some vids of cars with IR temp sensors on the tires and you'll see how fast the temps normalize across the surface. Its seconds. Basically you dont have enough time to get thru a corner and get off track to check distribution. Plus the braking as you come off is going to add heat to the inside.

Pyrometer is really best used in a dedicated skid pad where you can pull off immediately and have an assistant measure. But in general, looking at tire wear across the tread is going to be your best indicator. Also if you're in a location that picks up OPR, looking at where it builds up also will tell you where you arent scrubbing as much as the rest of the tire.

Thanks for the enlightenment guys

I have read that the IR sensors are garbage and you need something with a probe that can get below the tire surface. I think this was recommended but I can't remember what forum i was reading about it on.

"Joes Racing 54005 Pyrometer with Adjustable Probe"

The single point IR sensors are pretty useless because the temp on the surface definitely changes too fast to measure if you arent measuring as its changing.

You can see it here really well.
The probe gives you more time, but its still not enough for coming off track and measuring.

That's why I said it's part of it. It definitely helped in setting up my car. It's not the end all be all thing to go off of though. We also checked the temps in the hot pit. No cool down lap.