Odd tire middle tire wear track day

[PayamFSU]

Hey guys went out to FIRM track day and noticed this odd tire wear the past two times I went out , actually had to swap fronts left and right and run the tires backwards (dry day). At first I thought maybe the first time it happened was due to overinflation because I was aggressive one session and tire pressure went up to 38.5. This time I ran it consistently at 34 psi hot but same issue , I understand the outside wear from not enough camber but why is the middle so uneven?
I did notice this after I lowered the car but I also had PSS on the fronts before I lowered so not sure if maybe I missed this ? Not sure if it's related to the Eibach springs ? If anything thought it would help, as my camber is 1.5 in the front. Before anyone asks I did have an alignment and everything was in spec , except I ran 2.5 negative camber in the rear. Of note the right rear kinda has similar wear but not as bad as the right front. Would like some help to figure out this issue from more experienced track guys since I'm new to all of this. Thanks.

[MaynardZed]

Looks normal to me, you're starting to get enough heat into the tire. Track was counter-clockwise I assume. Normal to need to rotate tires. 36-38 is about the correct hot temps. 34 a little low.

[Pic18]

Seems normal to me as well, especially for the RE-71. I get the same middle wear when new. Once you use them a bit more and rotate it will even out a bit. I usually go 3 track days on one side, then re-mount the tires (to switch sides) and get at least 3 more days out of them.

I heard you can run them backwards, but have not had good experience doing so (scalloped wear). I would just move them front to back a few times, then re-mount to switch sides.

[PayamFSU]

Track is clock wise. Thanks thought it was odd that the middle wore more than the first part of the outside edge , but I guess this is normal which I'm glad. Why did you think it was counter clock wise ? - edit in an idiot I wrote right but meant left like drivers side , to used to inverting things looking at X-rays and CT all day.


What does scalloped tread for a tire mean?

Thanks guys.

[OhioRiderAaron]

Looks pretty normal to me as well. 34PSI hot is low from my experience. How do the shoulders look?

[Pic18]

Originally Posted by PayamFSU

Track is clock wise. Thanks thought it was odd that the middle wore more than the first part of the outside edge , but I guess this is normal which I'm glad. Why did you think it was counter clock wise ? - edit in an idiot I wrote right but meant left like drivers side , to used to inverting things looking at X-rays and CT all day.


What does scalloped tread for a tire mean?

Thanks guys.

What I meant by “scalloped” was that when I ran them backwards I had uneven wear in the outer third of the tire. Basically between the shoulder and the center rib was worn out more, like I had scooped out the middle of the tread block. Kind of hard to explain, but long story short I have never run them backwards again and have not had that time of wear again.

I also run mine about 38 hot as others have mentioned.

[Pic18]

Here is one of my tires to show what I mean. Center rib has evened out. Bottom of the tire is the uneven wear I experienced running them backwards.

[OhioRiderAaron]

Originally Posted by Pic18

What I meant by “scalloped” was that when I ran them backwards I had uneven wear in the outer third of the tire. Basically between the shoulder and the center rib was worn out more, like I had scooped out the middle of the tread block. Kind of hard to explain, but long story short I have never run them backwards again and have not had that time of wear again.

I also run mine about 38 hot as others have mentioned.

I always assumed that was a normal wear pattern. Every tire I've put on the track has exhibited the same wear (street tires + limited camber setups). Could be totally wrong tho

[F3IGHTY]

Normal

[Psychotic Mouse]

The center thread Block has less "Meet" than the outer Blocks. So it experiences more movement, and thus wears faster when new. The side scrubbed/eaten away it to the outside of the car. When cornering you are presenting a squared edge to a lateral force. this with the block movement will eat that edge away quicker in the beginning until the tyre evens out like stated above.

[tomo7772]

RE71R has really soft rubber compound. If you got understeer or over speeding cornering. It could happened, but normal thing.

Sorry my ride is 435i not M4, but kind of track car. And, mines have 265/35/18 squire size. I run 31psi in hot. This is the most common setting in Japan, but you guys said running 34~38psi in hot. This is the first time to hear about 71R's setteing... I do not know which is correct. I just wanna try higher psi.

[PayamFSU]

Awesome thanks for the input guys. I am new to tracking and wasn't sure .

[nicknaz]

Originally Posted by tomo7772

RE71R has really soft rubber compound. If you got understeer or over speeding cornering. It could happened, but normal thing.

Sorry my ride is 435i not M4, but kind of track car. And, mines have 265/35/18 squire size. I run 31psi in hot. This is the most common setting in Japan, but you guys said running 34~38psi in hot. This is the first time to hear about 71R's setteing... I do not know which is correct. I just wanna try higher psi.

you guys should get pyrometers and check it out the temperatures across the tires (inner/middle/outer) with the different pressures. I think that's the "definitive" way to check?

[MaynardZed]

Originally Posted by nicknaz

you guys should get pyrometers and check it out the temperatures across the tires (inner/middle/outer) with the different pressures. I think that's the "definitive" way to check?

This is correct, but probably more "germane" for those that use slicks or at least DOT slicks like hoosier R7 and similar. It's kind of a PITA, gotta do it as soon as you come off track, record temps, etc. I know a couple of track "nerd" types that do it. One guy made his wife do it. She stopped coming to the track.

Most of the guys I W2W race with just check tire temperatures (if we remember). One degree difference in hot pressures can make a difference for sure. Usually though, its whoever drives better wins.

[tomo7772]

I use Longacre 50640 pyrometers. This is awesome. I got F 3.3 negative R 2.5 negative camber on it. Then, I checked tire temp, there is no problem. There is just 5~8℃ difference between inside and outside. Sometime, I feel I got too much camber on front, but I run not only track, but also autocross, so It's fine.

PITA guys are all over the world. Especially, 35GT-R, GT3RS guys are acting like " move get out the way #&%$#"...

I just wanna have enjoying track life!