RE-71R experiment?

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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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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nismosis

Got to play with the RE-71Rs at the NCM Match Tour this past weekend. The lot was pretty new asphalt with a dusting of sand. Laid down 4 TnT runs and 14 Match runs. Ended up running 39-40psi front and 33-34psi rear, with Koni's at ~75% front and ~80% rear. Took the trophy in BS on Saturday, but lost in the Sunday semi's of the club shootout. The tires were fantastic all weekend. Lots of grip, good audible feedback, and heat up quick even running first in the mornings (more than my R-S3's did). However, by the 5th shootout run, which were only about 3 minutes apart, they were greased. I ended up with a DNF coming out of a 180 sweeper into a slalom....front end pushed and hit the first pointer while holding the same line as previous runs.

zpower86

Congrats on the win! I was just happy to be somewhat competitive considering my tire handicap.

AK370Z

YES!!! I'm not the ONLY one with similar setup!!!! Do you have any videos of your runs?

I am on 275/35-19 re71R and run EXACT same pressure 39F and 34R cold. I have rear 8/10 stiff and front about 5/6 stiff (and looks like I should bump it up half a turn maybe?). Everyone tells me to do otherwise (super soft rear and stiff front and honestly, I didn't like it at all.)

Question, do you have any trouble getting grip in super super smooth asphalt venues? I'm experiencing a little under-steer or lack of front end grip with this setup in just ONE of my three venues? other two venues I'm fine. This venue has a slippery super smooth newly sealed asphalt. In this venue, would you soften the front koni a bit or stiffen even more to 80-85%?

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14BlackCherry

I think our setups are very similar. I have 275/35-19 RE-71R too and Koni's and Eibach front sway full stiff. I just got back from the Utah Match Tour in Farmington, UT. It was a new location I guess and it has new asphalt. I was only able to place 4th on the first day and missed out on the shootout. However I got randomly drawn into the bonus shootout and finished 2nd there. In regards to your comment I noticed these tires weren't fans of the afternoon heat which was hovering around 100 degrees, I'm not sure what the surface temp was. Traction dissipated and the surface was slick almost grease like. I think they're awesome tires and they're wearing quite nicely. I have 24 runs on mine and probably 200 miles of actual street use on them. They have this weird 45 degree wear thing going on though which I guess is normal because other local drivers are experiencing the same. Still good amount of meat left.