I've always felt that the Toyo 888s were garbage and their woes seem to continue with the new R888R. Be very very careful. I've seen this happen on the old 888s but even the redesigned tires appear to have serious issues...

https://rennlist.com/forums/racing-a...during-de.html

 

If you cut across big curbs thats what you get. Its a known problem. Same with R888`s.

 

Tires don't normally fail by rolling over track curbing. That's what it's there for. I've always been vocal about my opinion of the Toyo 888 brand of tires. For those using these, it's certainly their prerogative. All I'm saying is be very careful. Numerous failures of the same type of tire in one day is not coincidence, it's a design issue or a manufacturing defect of some type.

 

I should put a set of these on my 1st generation Forgestars along with their Chinese lug bolts and show up at Miller next month . Will John test drive my car?

 

Now that's funny! Don't forget to add some Agency Power suspension components and some Rotec seats to give me the warm and fuzzy...

 

Oh wow

 

What's your car # so I can avoid getting assigned to it

 

What kind of camber and tire pressure did these guys use?

 

I would like to disagree: it's plain ignorance of the users. Pick any brand of tires you like and ask the manufacturer for approval for use on our cars. For 19" you will not get any except Michelin, because the cars have too much weight on the rear.

There are only a few tires that are capable of taking the load at max speed up to camber of -2 degrees. Most tire manufacturers will not approve an OEM vmax, let alone any higher.

I have seen blown R888 on dynos. Almost the same defect from a plain visual "inspection".

We have guys here in Germany running R888 way over 360 km/h and you won't even get an approval for 300 km/h for them. I could't care less if they would't risk other lives as well.

So my advice would be: don't run any tires that even the manufacturers don't trust.

 

R888R 295/30-18 has speed rating and load index of 98Y XL, which means that it is rated to 300km/h and 750kgs. But it seems that it's just not up to it's ratings.
MPSC2 295/30-18 has speed rating and load index of 98Y XL (no N-spec available) ...but it can take the punishment.
I was hoping that R888R would be introduced in e-approved 325/30-18 (there's DOT-approved one already), but after seeing those pics, no. Will not buy.

 

From my personal experience

R888 - 315/30-18 in the back paired with 235/40-18, maybe had like 3 sets, no problems besides after few HC they loose a lot of grip, other than that really no problems
Compound was GG - so the harder one, car weighted like 1500-1550kg

I have started like 1.8-1.9bar cold and tried to keep them @2.0-2.5bar or so hot, I have used moderate camber (<-2 F/R) but also -2.5F/-3.5R. If they have lasted longer and had grip till the cords, R888 would have been my first choice of Rcompound tire, but not the case LOL

Now will try 335s in the back and 275s in the front, will come back to report here.



On my GTR I have tracked 285/315 R20 of the newer version R888R, not many laps but still no problems

 

thanks for the post now I'm thinking how's it gonna affect roll racing

 

Actually... what would it take to get involved? This is with PCA correct? I have some work to do on my car but it could be done in a week or two. I promise not to show up with Forgestars of course.

 

It's super easy, yes it's the Intermountain PCA it really well run this next event is a combination of outer loop 3.2 miles and full track over 4 miles. Even if you came down and just did one day you would have a blast. I can send you a link to sign up. Would be stoked to hop in your right seat. Even with the Forgestars. been racing and driving that track since 2007
https://www.motorsportreg.com/events...ountain-490266
For this event they like you to have previous track experience but there is also a NASA event about once a month.
www.nasautah.com

 

See, there are good news also for the 6Gt2 tire combo.
In 295/30 i wouldnt even think about using toyos. Go for cup2 or trofoe R`s