I want to get summer performance tires for my IS500 and was looking at the Michellin Pilot Sport 4.
What is the widest I can go on the stock LE BBS wheels?

 

265/35/19 front. The rear will need to be some kind of compromise because the rim is only 9 1/2" wide. Nothing wider than 285 is recommended for a 9 1/2" rim, and neither of the options in that width are a like size replacement. 285/30 will be a little smaller diameter, and 285/35 will be a little bigger diameter. Pick your poison.

 

Michelins are notorious for running wide so I'd go with a 275.

 

I had Michelin PS A/S 4's on my old IS, and they were fantastic in wet rainy florida weather(and in the dry of course). I can't wait for these crap Bridgestones to wear out so I can get some new shoes. I am curious if the IS500 has the same tire wear issue that some of the older 3IS's had.

 

I'm going with Michelin Pilot Sport 4's right away. Will sell the Bridgestone's for $400 +-300miles

 

The suspension is unchanged. It will have the same issues for the same reasons. Ditch the big squishy bushing at the back of the lower control arm in the front, get a decent alignment, and you'll no longer have wear issues.

 

I get what you are saying regarding the bushing, but I do think it prudent to point out that the suspension has been changed. It has lighter components thanks in part to more use of aluminum in the A-arms, lighter coil springs, and a lighter sway bar.

At 7,600 miles on my 2021 IS 350, I haven't seen any sign of uneven wear yet on the stock Potenzas. This is including a lot of highway miles, city/surface street driving, and a few mountain runs. I'll update the ole tire wear thread if this changes.

 

My 2006 IS350 had zero wear issues until I got an alignment. If you toe-in the front wheels 0.4 degrees on each side, you'll have pretty even wear unless you routinely brake very hard. Doesn't mean it's fix because they changed the arm material, they're still using the big squishy donut bushing which is at the root of the problem. The wheels toe out severely under hard braking. The only way to limit this is to brake softly all the time, or replace the rear bushings with Figs or RRRacing's units. The wife's GS F is no exception, and has the same aluminum components you mentioned.

 

Right, I didn't mean to imply that the aluminum was the solution to the problem, more just that... yeah, the suspension is not apples-to-apples with the 2020 and earlier models anymore.

 

So it seems from this thread Michelin Pilot Sport 4 S is the best tire to go with. But if I did want an all season just to save a few dollars and have tires that last a bit longer. What is the difference between the 3+ and 4 for the pilot sport all seasons? Would it even matter between the two?

 

4 is a newer line of tire than the 3+. It would theoretically have better performance.

edit: Also, not necessarily will an all-season outlast a summer. But most times, they will.

 

Yeah, that's what I was thinking but the 3+ has slightly better reviews than the 4 on the Michelin website so I was curious if someone here had some insight into the two and why that may be. Of course I think it was 4.4 to 4.5 so I guess it's such a miniscule difference it shouldn't affect my decision. When my Bridgestone need replacing I'll probably choose between the pilot sport 4 summer vs 4 all season

 

I have a 350, and even I am thinking of going with the Pilot Sport 4S once my Potenzas wear out. If I had a 500 I think I'd have to go with the Michelins as well due to it being heavier and having more power.

 

The A/S 3+ is discontinued. I just tried to buy them, there are none available in GS F sizes.

 

Good to know, now it's even easier to make a decision