(2015) 200+ Treadwear Autocross Street Tire Thread

[rx3]

Originally Posted by tahdizzle

That was in tracking in a corvette. In that same review he says they are great autocross tires.

Pretty much he says (its better to use an R comp for track then using the re71r)

He drove a Fiat near the Corvette Museum.
What got my attention was the fact that he lost 5 seconds on a 2:38 lap (compared to the A048). (2.38 is not that much time).

[rx3]

Here's a video of a Slalom/Autocross on R888: [ame]http://youtu.be/mFDPw1OQzaQ[/ame]

One can see that lateral accelerations of up to 1.2 g are reached frequently. Unfortunately, I don't have one with the R1R but maybe someone has one with the RE71R for comparison?

[vroom4]

Originally Posted by tahdizzle

What sizes are you testing?

245 40 17 is the only toyo I have access to

[Cueman]

Originally Posted by rx3

Here's a video of a Slalom/Autocross on R888:

One can see that lateral accelerations of up to 1.2 g are reached frequently. Unfortunately, I don't have one with the R1R but maybe someone has one with the RE71R for comparison?

That's pretty gnarly to be doing with zero safety gear... not what we would typically call autox, but I guess that speeds aren't far off.

For most of us, the R888 is not a consideration at all, as the rules make it illegal as a street tire, and it's WAY slow compared to the other DOT "race" tires it is classified with.

[Kostamojen]

Looks like more of a hillclimb mixed with a little autox.

[Briankbot]

Originally Posted by rx3

One can see that lateral accelerations of up to 1.2 g are reached frequently. Unfortunately, I don't have one with the R1R but maybe someone has one with the RE71R for comparison?

I put on 225/45 RE71Rs recently and just went to a parking lot for a baseline "skidpad" test. I didn't mess with pressures or anything and hit 1.28 according to my iphone app. This was on what appeared to be older asphalt with the TRD springs&bars/CS setup. I'm sure there's more grip to be had with a bit more dial in....

[xwd]

Originally Posted by Cueman

That's pretty gnarly to be doing with zero safety gear... not what we would typically call autox, but I guess that speeds aren't far off.

For most of us, the R888 is not a consideration at all, as the rules make it illegal as a street tire, and it's WAY slow compared to the other DOT "race" tires it is classified with.

LOL I was going to ask why we are talking about the R888 in a 200+ TW autocross tire thread.

The R1R in the larger sizes was never as fast as the RS3, Z2*, etc. so I don't expect it to be in the same ballpark as the RE-71R. If it was national competitors would be using them, and right now all anyone is using is the RE-71R and Rival-S.

[rx3]

Originally Posted by Cueman

That's pretty gnarly to be doing with zero safety gear... not what we would typically call autox, but I guess that speeds aren't far off.

Well, you do have safety gear: Helmet, seat-belt, have plenty of airbags, crumple zones and as you said: speeds aren't far off. But most importantly there's no opposing traffic - I often find normal traffic more dangerous. (Besides, there are plenty of marshals with fire-extinguishers and there's always an ambulance on stand-by.)

Originally Posted by dwx

LOL I was going to ask why we are talking about the R888 in a 200+ TW autocross tire thread.

7thgear was asking how it compares to the R1R.
And I read the comment about that RE-71R which lost 5 seconds compared to the A048 on a relatively short lap. Since the R888 is comparable to the A048 this let me to conclude that the RE-71R may not necessarily be faster, than the R1R (since I know that the R1R is definitely not 5 seconds slower than the R888). But my assumption may be wrong and if it's wrong the RE-71R could also be an alternative to the R888 (which is legal where I drive and is used by most people here).
The question would then be: How/why can a 200 treadwear tire be faster than a 100 treadwear tire? (Unless that number is just arbitrary.)

[Kostamojen]

Because that number is indeed completely arbitrary.

[Lithium]

I too have frequently hit 1.2 Lateral G's on my stones.

[TrqlessWonder]

Originally Posted by rx3

7thgear was asking how it compares to the R1R.
And I read the comment about that RE-71R which lost 5 seconds compared to the A048 on a relatively short lap. Since the R888 is comparable to the A048 this let me to conclude that the RE-71R may not necessarily be faster, than the R1R (since I know that the R1R is definitely not 5 seconds slower than the R888). But my assumption may be wrong and if it's wrong the RE-71R could also be an alternative to the R888 (which is legal where I drive and is used by most people here).
The question would then be: How/why can a 200 treadwear tire be faster than a 100 treadwear tire? (Unless that number is just arbitrary.)

Your comparisons are running in a few too many different directions, with a few too many "close enough" assertions that probably aren't valid. I probably wouldn't judge the twins chances versus an MX-5 by looking at the gap between an RX-8 and 350Z. And that's kind of what you're doing here.

I do like the new bridgestones, and the consensus so far is that they're faster than R1Rs (qualifier - 200TW toyos, not the magical 195 pixie dust thing).

Plus, as we're hearing with the V720s, not all continents are necessarily getting the same compounds. So, even in the same model, we may not be getting the same things.

As for how a 200TW tire can be faster than a 100TW tire...the way those numbers are arrived at is somewhat goofy. You can understate the wear rating, but not overstate it. Sooooo....the ratings can be fudged a bit.

There's also very little autocross development done on the R888/RA-1/RR for autocross on this side of the pond. Any class where those tires are legal also have the Hoosiers available, and between those two, it's not even a mildly interesting contest.

[autoXracer]

Does the RE-71R in 255/40-17 benefit more than 245/40-17 for STX? Trying to decide between the 2.

[cjd]

Originally Posted by autoXracer

Does the RE-71R in 255/40-17 benefit more than 245/40-17 for STX? Trying to decide between the 2.

I'm not sure it's known, everyone else I've seen post up about them is either CS or on 245’s. I have 255 but won't get to run them for a couple weeks yet, and at the moment I'm still regaining confidence so may not be the best judge.

[renfield90]

Try it and let us know!