"02996ttx50

it's cool that you like them! i just remember the one time i tried the older iteration r888..

they were "louder' even than the left wing's fake news caterwauling lol

RDS928S

The new R888R is a completely different animal.

Plus it looks dam mean. Im keeping them on.

powdrhound

You will in all likelyhood be just fine using them on the street. I wouldn't run it at 190 on the autobahn but normal street use I wouldn't sweat. As far as I know all failures of the old 888s and now the new R888R have occurred under track use then the tires are highly stressed and subjected to the 180-200F temps and stresses that you will never encounter on the street. In my estimation, track use results in high carcus temps and in combination with high lateral and centrifugal forces (due to high speeds) these are causing the tires to delaminate and fail on the heavily loaded rear end of 911s. The 295s are likely the most affected due to their small load rating relative to the 305s, 15s, or 35s.

ghostofpain

There is a difference between the R888R and the R888. Its not just the new design. The diameter changed. The R888R got a smaller diameter than the old R888. Maybe thats why the structur got weaker?
I have heard about the R888 can show the same issues but only when going hard over curbs.
I would start with a higher cold pressure to avoid a damage.

Szpet

How big differece is it in the diameter? Any difference in width to?

Thanks

Carlo_Carrera

Not sure where you are getting your information, but in stock 996TT sizes the R888R diameters are exactly the same as the R888 were.

Adding more air pressure will probably not help much.

As it has been said before, if you are going to the track stick with the NT-01s.

ghostofpain

Thats not quiet right.
225/40:
R888 827 rev/mile
R888R 828 rev/mile

295/30
R888 828
R888R 831

That are some mm difference since the new R888R does have more rev/mile.

powdrhound

Hey Steffen,
This was posted in the original failure thread by a guy in Europe. Evidently failures of the R888Rs are showing up in other applications even on lightweight cars. Again, I would be very very cautious using these especially at autobahn speeds that you operate the car at since the impending failure of the tire does not seem to be visually evident from the outside. Goes without saying a failure at 300km/h could be disastrous. Yes, you can run the tires at higher pressures to increase their strength but that defeats the purpose as grip goes down at higher pressures. Every R compound I've run offers max grip in the low to mid 30s psi HOT which amounts to starting them in the mid 20s. Interestingly, Toyo is now saying that the warranty on the R888R is void if used at the track. This is pretty funny as the tires are marketed by Toyo FOR track use. Maybe they should instead be marketed for street / Cars and Coffee only? Based on failures reported, it seems that pretty much all are occurring on the inside of the tires which would indicate that when running track set ups with aggressive camber, the inside of the tires get overheated/overstressed and fail as a result. 911s run relatively high -2 camber (or higher with track set ups) from the factory in the rear and combined with the heavy rear loading this may be the perfect storm. This is just a guess however as people can certainly draw their own conclusions. Anyway, here is what he posted including the link at the bottom of this post which is in German:


This is not an isolated issue with respect to the R888R tyres. For a start just because Toyo did not have the imagination to come up with a different tyre name, let's not confuse the R888 and the newer R888R. They are different tyres, treads, etc. I do not believe any previous experience on R888 is all that relevant to the newer R888R tyres.

I also have a KTM XBow (lightweight track european track car). The German XBow forums have been reporting multiple R888R tyre failures on the 800kg XBow. Same issue - rear inside shoulder failure.

I also have an E46 M3. This time I had front wheel inner shoulder wear. Fortunately I spotted it prior to failure. When I removed the tyres it was obvious they were deteriorating from the INSIDE which you would not notice from the outside!

My view is these are to be avoided on all platforms - light or heavy. They are a very good track tyre (from a grip perspective), however the safety issue cannot be ignored imv.

Toyo have been informed in Europe and sounds like in US as well however the response seems to be the same luke warm response.

Reference material to back up the above. You may need Google translate

http://www.xbow-forum.eu/wbb/board58...35-semi-slick/

http://www.xbow-forum.eu/wbb/board58...r-die-zukunft/

Carlo_Carrera

Those differences are negligible. 1 and 3 revolutions per mile is not a size change and well within manufacturing and temperature tolerances. The listed diameters of the respective tires are exactly the same. As you mentioned, tire pressures will effect the RPM since the numbers are so close.

Spyerx

Looks like r888r has a 1600 or so rear load rating in 911 sizes 18". Nt01 is 1800+ in 911 sizes. 19" looks similar on both at 1800.

Load rating matters on 911s. I've burned through dozens of nt01 with no issues other than cording them.

ghostofpain

Thx John and the others. Seems that toyo got no new semi slicks.

I do not own R888R just R888`s in 6Gt2 size. I will run these tires on the track. Ive never heard of blown tires, just the failure at the inside shoulder, if you keep going hard over curbs.
On the streets i use Michelin PS2 or Pirelli Zeros with N identifier for Porsche, so they should take high speeds up to 210 miles/h (what you could do every day here on the autobahn by the way )

In europe we do not have Nitto`s.

You all know, that with awd the front tire needs to be bigger or at least the same size as the back one.
I am searching for a 255/35 + 295/30 combo. Thats possible with R888, cause they do have the exact same diameter. The r888R doesnt. The front one is smaller. But that doesnt matter cause the R888R did disqualify itself already.

If the R888 doesnt run well, i will give the Yokohama A052 a try with 255/35 + 295/30 or the Nankang AR-1. I heard good stuff about htis tire.

The 265/35 and 335/30 would be possible with Cup2 and Trofeo R, but i needed to modify my car dramatically, what i do not want.

s65e90

Voided warranty on track use for tires made for the track? lol sounds like crap/same junk to me.

ghostofpain

[QUOTE=s65e90;14456205]Voided warranty on track use for tires made for the track? lol sounds like crap/same junk to me.[/QUO]

powdrhound

I've never run Cup2s or Trofeo Rs but they get very good reviews. The Trofeos will be a more aggressive tire.

If I were you Steffen, I would go with a 245/40 and 315/30 set up for AWD. Compared to the 255/295 combo, the 245/315 is about 1cm taller and the tires will have a higher load rating which is very important, especially with the failure prone Toyos. Being a larger diameter, the 245 will have just as large (if not larger) contact patch as the short 255. Many guys don't realize it as they only focus on tire width, but as you increase the diameter of the tire you are also increasing the contact patch. The taller and wider 315 will clearly have a larger contact patch than the short 295. Any understeer/oversteer concerns can be dialed out with sways. Good luck...

khooni

Cup 2s are road tyres suitable for track
Trofeo R are track tyres that may be used on road.


completely different category of grip and wear....