RE-71R experiment?

stuy486

TireRack already conducted a back-to-back test of these two tires.

There's no talk of wear in that test, but I don't think you're test is going to answer that question either. There's a lot of factors that go into it, I think it's a pretty car-dependent issue. On our STU 350 we're not seeing wear that's crazy. We've got ~500 highway miles, 3 TnT runs, 12 Tour runs, and 24 ProSolo runs on them and they're looking fine so far, we're confident they'll make it through the next Tour and ProSolo events just fine. Are they wearing faster than a Hankook would? Probably, but it's not as bad as people are making it out to be.

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Z1NONLY

The time difference is similar to what Ruggles experienced between RS3's and the RE71R's.

It's huge.

However, the most recent pro solo didn't show the same disparities.

nismosis

You Southern and Coastal guys have such a seat time advantage! I'm planning to start the season in May with the RE71-R's in BS. Will report back for all.

Z1NONLY

Ok, how then do we go about answering that question?

What's to stop Hoosier from stamping "200" on the side of their A6 and saying "there is an official test that we conducted that proves this to be 200tw.....trust us."?

If proving that two tires with the same tw rating wear at very different rates is not proof of a false tw, rating what is?

gomer_110

TW testing is conducted by an independent lab/facility and establishes the maximum tw number a manufacturer can put on the tire. The manufacturer may choose to put a lower number on the tire if they choose however. This is why in the autox world lately there have been a number of tires that have gone from 180 to 200 tw. Those tires were really 200 tw (or maybe even higher) tires all along even though they were marked otherwise.

You also need to remember that while somewhat related, tw and gripiness of a tire are two different things. Currently there is no industry testing for rating the gripiness of tires.

This was all from a discussion 2 days ago I had with a tire engineer from Cooper Tire.

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'17 Titan Bone Stock

Z1NONLY

I have heard this rumor before but never seen any solid information on it.

Do you have a link or something?
This is from tire rack:

"When looking at UTQG ratings it is important to realize that the Department of Transportation does not conduct the tests. The grades are assigned by the tire manufacturers based on their test results or those conducted by an independent testing company they have hired. "

So the tire makers can do their own tests, report whatever thay wish, and roll the dice on someone calling the government in before they change /drop the tire in question.

gomer_110

Like I said this was all from a conversation with a tire engineer from Cooper Tire.

Here's a link from wikipedia that explains the testing though: Treadwear rating - Wikipedia, the free encyclopedia

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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock

speedfreek

From what I have always heard, is that the standard is not closely regulated by the DoT. So it is difficult to compare the TW ratings from one company to the next. But when looking at just one manufacturer you would think they would have a metric they base each their tires off of and thus the consumer can use that information when considering to purchase tire A vs tire B. If they are really stamping 200TW on a tire just to meet a regulation for a competition that is not good business. If I was a competitor at the manufacturer level you better bet if the TW continues to go unregulated. I would have to follow suit to make sure my sticky compound meets the requirements set forth by the competition's governing body so that I meet the demand of that market.

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Z1NONLY

Here's the problem:

UTQG Treadwear Numbers: What Do They Mean? - Motorsport Messages from Marshall | Tire Rack

"UTQG treadwear numbers are published by the manufacturer based upon their test findings of a tire's life expectancy. It's important to note that not all manufacturer's standards are equal and similar ratings may lead to different real world results between similar product types."

Rusty

I used to work for Goodyear in the early '80's. I know back then. Each manufacturer had they own testing standards. No two manufacturers were a like. The manufactures tests each other tires to see were they stand with their own. They also back engineer the tires too. Nobody is pulling the wool over their eye anymore. As far as tread wear and temp ratings. The manufacturer puts on what they feel is a representative number after testing.

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