Mingofish

Depending on ride height and wheel offset, fronts with 275/35/19 will likely scrub.
275/30 will most likely scrub as well unless very high offset like oem rims.

Mine scrubs on both sets of aftermarket rims at full lock.
The 19” set is square, and are +35 with R888R 275/35
The 20” set is +32 on the front with PS4S 275/30

Due to the high offset of the oem fronts, 275/35 AD08R barely scrubs on track, and only at high speed high compression corners. On the street, it’s totally fine.

FWIW,
My ride height isn’t super low but is lower than stock.
Also my camber is high typically -2.6 to -3 compared to stock suspension that’s lowered are -1.5 to -1.8

Btw I think you’ll like the AD08R as a street/hpde tire.
I’ve ran that exact 275/30 front and 275/35 rear set up.
Have also ran 275/30 square and 275/35 square.
Couldn't tell much diff between the 3 sets. All were decent.

BretTravis

The 2015 OEM PSS had 16K & 5 events on them when I replaced with the much praised 4Ss(XL). The 4Ss have 6K & 2 events are in worse shape than the OEM I changed out. Another individual was shocked that his brand new 4Ss were showing pretty good wear 1/2 way through day 1 at Drivers Edge Motor Sports Ranch. I ran 1 event early March this year with AS3+s. They held up really well; but, understeer got me a couple of times.

BretTravis

Thanks Mingo, I have two sets of factory wheels. AS3+s for winter. Sounds like I should stick with stock stagger.

Mingofish

Bret,
If you run square, the car will plow less.
I bet you were driving faster, or attempting to, on the PS4S compare to the PSS. Is that a good guess?

Also, have you changed out lower control arm bushings?
Were the tires worn on the inside edge?
our car has a lot of dynamic toe change under heavy braking.

lobuxracer

iTrader: (2)

This could not be overstated. The OEM bushings create HUGE dynamic toe changes. Polyurethane bushings are a huge help, and solid bushings eliminate the problem.

RCFDubai

Trofeo R made huge improvement on track over stock P Zero on my 2006 Maserati Gransport which is a V8, 4.2L, 400HP car. Braking, cornering all highly improved. This is highly praised over Cup2 when I researched prior to purchase.

Heard good things also about R888R, want to give a try so I'm so in between.

Mingofish

Thats a great tire but...
Thread life is dismal since it is a utg 80 tire. A few track buddies of mine run them. Grip is stupid!
Second is no fitment if trying to run square since they don't make a tire that would work in the front on rcf. Don't want 255 staggered front on track.
If running as a daily tire, they suck in rain.
Plus they're cray expensive, but not that Cup2s aren't.

R888R are not gonna be as sticky.
If you're use to the Trofero grip, you will be disappointed.

RCFDubai

Thanks Mingofish. Added my feedback:

Thats a great tire but...
Thread life is dismal since it is a utg 80 tire: Yes!

A few track buddies of mine run them. Grip is stupid!:
yes, yes

Second is no fitment if trying to run square since they don't make a tire that would work in the front on rcf. Don't want 255 staggered front on track:
did not understand this part, no correct size for front?

If running as a daily tire, they suck in rain:
No rain at Dubai But they are as far as I know also good in light rain but aquaplanning is big risk.

Plus they're cray expensive, but not that Cup2s aren't:
and therefore Trofeo R was a better choice for me due to high confidence provided on track as accident would be much more costly. Maybe I'll go 18s for track if calipers fit as separate set which are better if you use the cerbs. Amy experience here with 18s?

R888R are not gonna be as sticky.
If you're use to the Trofero grip, you will be disappointed.
OK. The new R compound got a lot of praise though but it's another league of course. For the period of getting used to the car, it's an economical transition tire. When ready for limits, switch to Trofeo. Would get more track days with this step up approach also in new tracks where you need learning curve.

Mingofish

^^^ Dubai

Trofero doesn't make a 275 tire. So you'll have to run 255 fronts (or may be they make 265. Not positive) and a 295 rear. The stagger set up makes the car want to understeer. I run 275 square on track.

18" to clear calipers is difficult. A custom designed rim with the right padding and back spacing is possible. I spoke to BC Forged a while back and think they can make one. But I ended up just buying a standard Advan rim in 19" due to cost.

I run R888R now and the tire has held up very well, thus the longevity has reduced the tire consumable cost way down. May be that's not as important to you but it is for me.
Still on the same set as last year and the tire has had like 15+ track days on them. They are a little heat cycled out so the grip is not that good now compare to new. Time for a new set soon even though I still have a little bit of center tread left.
Also keep in mind almost all the miles are on track so I'm not street driving with high negative camber.

RCFDubai

Then topic back to Michelin vs Michelin. Great feedback for me already, many thanks.

05RollaXRS

Very odd how RCF and RCF track edition have been rolling out of the factory since April, but Michelin has not started advertising the RCF-Spec MPS4S tires on its website. Waiting to see how the specs compare to the standard MPS4S.

flowrider

iTrader: (9)

^^^^I don't believe "advertising" is the correct term. They do not yet have a listing for the 2020 RCF. But, then again, they do not have a listing for any 2020 Lexus vehicle. The only makes that are listed for 2020 are Kia and Toyota. Give 'em time I don't find it odd at all. It will be uppated soon enough.

Lou

05RollaXRS

Yeah, that is what I meant.

05RollaXRS

Another great testimonial for the Pilot Sport 4S. He hits all of the important points especially pertaining to gripe of my RCF is horribly mismatched with the soft Super Sport tires.

BretTravis

Just updating: due to financial considerations; I ended up buying 2 PS4Ss 275/30 for the front. First track day result: understeer nearly eliminate; to the point that I actually felt a little oversteer. Wow. The wear was acceptable, no chunks missing, tread remaining, all good. Noticed the front 275/30s from 34 psi to 42-44 psi while the rear 275/35 from 34 psi to 38 psi (nitrogen filled). All indications I should make the rest of the year 3-6 track days.