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      04-24-2019, 11:28 AM   #1
Dreamer99
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Tire wear at the track

Hey guys, help me read the front tire wear. The middle band of tread is worn down on the outside edge more the the outside band at its inside edge. Does this look like normal wear? I was running around 38psi taking measurements right after a cool down lap.
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      04-24-2019, 11:37 AM   #2
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You're dragging the tire across the pavement which is causing that to happen. It's a symptom of incorrect tire pressure. I used to have the same problem until I bumped up my cold pressure by 1 or 2psi.

Two questions: what's your alignment like, and what cold pressures are you running?

Pic related from when I had it on my car.
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      04-24-2019, 11:42 AM   #3
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Quote:
Originally Posted by Dreamer99 View Post
Hey guys, help me read the front tire wear. The middle band of tread is worn down on the outside edge more the the outside band at its inside edge. Does this look like normal wear? I was running around 38psi taking measurements right after a cool down lap.
This happens on virtually every RE71R at onset. My guess is it doesn't help to have a camber limited from setup but no this is not unusual.
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      04-24-2019, 11:49 AM   #4
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Quote:
Originally Posted by z3papa View Post
This happens on virtually every RE71R at onset. My guess is it doesn't help to have a camber limited from setup but no this is not unusual.
This isn't a camber issue or he'd be seeing extra wear on the outer edges of the tire. Like I said, it's because the tire is being dragged across the pavement in the corners. Fall-Line saw my tires doing this and immediately told me it's not an alignment problem, and they were right.

OP, please post your alignment info and your cold inflation number.
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      04-24-2019, 11:50 AM   #5
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It was a cool day so I started at 30/31 psi and after my first session it was up to 40psi so I bled it back to 38. After my second session it was back up to 40 psi so I brought it back to 38 again. I measured the pressure the next day cold and it was 27/28.

I have -2.25' with zero toe for the front alignment.
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      04-24-2019, 11:51 AM   #6
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Quote:
Originally Posted by dparm View Post
This isn't a camber issue or he'd be seeing extra wear on the outer edges of the tire. Like I said, it's because the tire is being dragged across the pavement in the corners. Fall-Line saw my tires doing this and immediately told me it's not an alignment problem, and they were right.

OP, please post your alignment info and your cold inflation number.
In my circles, that is commonly referred to as the groove of doom.
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      04-24-2019, 03:48 PM   #7
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I had that issue with the center block too. Didn't run RE71R again after that set.
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      04-24-2019, 04:46 PM   #8
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This is a tough one. Your hot pressures are already fairly high, so raising your cold pressures isn't going to help like it did for me.

I wouldn't really call it a huge problem unless the wear is so significant that you're getting into the wear bar before the rest of the tire face is gone. It might just be the reality of your car's specific setup, your driving style, etc.
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      04-24-2019, 05:08 PM   #9
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They are worn down pretty close to the wear bars. I could definitely drive a little smoother to help preserve the tread life. I was on a technical track, Island Motorsport, with 19 turns over 2.3km.
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      04-24-2019, 08:50 PM   #10
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The wear is abrupt at first and slows substantially. They aren't great wearing track tires if you are really pushing it for extended runs but they start to wear more evenly through their life.
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      04-25-2019, 07:06 PM   #11
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This is classic RE-71R wear and happens regardless of pressures you set; I ran 35-36 PSI hot.

The only cure is aggressive tire rotation. I get about 12 heat cycles from a set of RE-71R at most these days before I have to throw them away.
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      04-26-2019, 10:06 AM   #12
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I emailed Bridgestone a picture of the wear and this was their response:
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      04-26-2019, 10:18 AM   #13
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Quote:
Originally Posted by redpriest View Post
This is classic RE-71R wear and happens regardless of pressures you set; I ran 35-36 PSI hot.

The only cure is aggressive tire rotation. I get about 12 heat cycles from a set of RE-71R at most these days before I have to throw them away.
2-3 days? That's not much of a budget HPDE tire is it?
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      04-26-2019, 10:46 AM   #14
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2-3 days? That's not much of a budget HPDE tire is it?
Agreed, 2-3 is laughable. Maybe being overdriven or something?
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      04-26-2019, 11:19 AM   #15
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Sounds like this will be my first and only set of RE71R's. I'm hoping to get 10 track days out of a set of streetable tires. What would be a better option, the RS4 or AD08R?
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      04-26-2019, 11:43 AM   #16
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Quote:
Originally Posted by Dreamer99 View Post
Sounds like this will be my first and only set of RE71R's. I'm hoping to get 10 track days out of a set of streetable tires. What would be a better option, the RS4 or AD08R?
I've had good tread life on my RS4's. Hard to say how many days exactly because I was swapping out with another set of wheels. That said, they discontinued the 275/35/18. So your choices are either the 265 or the 285. I think the 265 is too narrow. I ran them last year and they chunked on me in hotter weather. I'm currently using the 285 and like it a lot. We'll see if they chunk when the weather turns hot. I'm hoping the larger size will help with that (it's .8" wider than the 265).

The AD08R is an old tire and won't have the grip of the RS4. It's also really expensive ($384 for their 265/35/18). Looks like Tire Rack has a lot of older stock in some sizes which probably means it's being phased out in favor of the new AD052.
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      04-26-2019, 11:54 AM   #17
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I could see getting 4 days out of an re71r, but I'd be so nervous on the 4th day I'd cord em and lose the rest of the sessions. Mine wore exactly like pictured, it's just how they wear.

If you want BUDGET track day tires, look at the indy500s, sumitomo z3s, ps91s or similar. They won't be anywhere near as fast (WUT NO TROPHIES?), and the sumis and ps91s will chunk, but you'll get >4 HPDE days out of them and save a bunch of money.
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      04-26-2019, 12:38 PM   #18
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Quote:
Originally Posted by Dreamer99 View Post
Sounds like this will be my first and only set of RE71R's. I'm hoping to get 10 track days out of a set of streetable tires. What would be a better option, the RS4 or AD08R?
You're asking for a lot. Street tires don't last long at the track, but I guess it depends on what you consider a street tire. "10 track days" is also a tough benchmark because each event is different: ambient temps, your driving style, the specific track/configuration (unless you're always at the same track), etc.

The AD08R is quite durable, in my experience.

I would just get a different tire and see what you think. Maybe you're willing to pay a little more for the AD08R, for example, because it lasts a bit longer but sacrifices ultimate grip. Or maybe you'll find a certain tire fits your driving style better.
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      04-26-2019, 12:53 PM   #19
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What I meant by streetable is at least street legal. I have a 100km drive to one of the tracks I go to.
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      04-26-2019, 01:27 PM   #20
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NT01 for 6-8 days. RS4 I got about 8 and had lots of tread left but it seemed to have heat cycled out and didn't grip well. Tossed those early.
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      04-26-2019, 01:32 PM   #21
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Quote:
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NT06 for 6-8 days.
Is that NT01's on the rear and NT05's on the front?
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      04-26-2019, 01:39 PM   #22
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What I meant by streetable is at least street legal. I have a 100km drive to one of the tracks I go to.
Yes, but an NT01 is an insanely aggressive tire to drive on the street, especially after it starts to wear.
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