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Discussion Starter · #1 ·
That's the bad news. The good news is the car can be ordered with a spare tire, all are coming that way now. So there is no reason to switch to a good, conventional tire.

On the sport I saw the tires were 245/40-19 Dunlop SP Sport 5000M DSST CTT, listed by Tire Rack as an Ultra High Performance All-Season: http://www.tirerack.com/tires/tires.jsp?tireMake=Dunlop&tireModel=SP+Sport+5000M+DSST+CTT Tire Rack only has 15 customer reviews dating back to 2009. Few tires are rated lower by the owners.

On the two standard models the tires were Bridgestone RE97 A/S RFTs. This most be brand new. The RE97 appears to be a new tire for 2013 with the few Tire Rack reviews being from Cadillac XTS owners. They don't like it.

Right now, if you must go runflat, your best choice is probably the Bridgestone RE960 A/S Pole Position RFT. Introduced in 2011, it is an RFT model of a tire introduced in 2007 whose replacement, the RE970 AS Pole Position, was introduced in 2011.

However, if you have the spare, I recommend adding a inflation kit with sealant to the trunk (about $40), getting the spare, and changing the tires. For most, the new for 2013 Michelin Pilot Sport AS3 is probably best. Latest technology all-season, it has a 500 wear rating.

If performance is your goal, the Michelin Pilot Super Sport has been the premier high performance tire for 2-years. Two 2013 attempts to knock it off its perch were unsuccessful. It is not the first choice for track days or serious autocross competition, but should be the best high performance street tire you can get. Wear rating 300.

If you find the Michelins a bit pricy—they are about 50% more than most of their competition—there are Bridgestone and Continental models that are quite good. Just not as good. Including the RE970 A/S (wear rating 400) mentioned previously. For example, the RE970s are $912 at TireRack, the PS AS3s are $1076. The PSSs are $1092. The RE-11 is $920 and the S-04 Pole Position is $804.

The choice is much sparser for the non-Sport model. The standard 225/55-17 is an odd size. Michelin does list he PS AS3 in that size and Conti has the ExtremeContact DWS. The 7.5" rim can also fit a 245/50-17, but that is also an odd size. The Conti DWS is available in that size though.

Michelin info on their tires: Shop for Ultra-High Performance Sport Tires | Michelin Tires

Conti UK video on inflation kit:


This is the less expensive Slime kit with the same functionality:

Even if you stick with the runflats, I recommend carrying the inflation kit with sealant. Running on the zero pressure runflat makes the tire unrepairable and frequently damages the rim at the same time. This is a big topic on the BMW forums that have used the same 19" size tire for years. The replacement for the runflats are very expensive.
 

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Wow, those reviews are worse than bad. I've never replaced tires between leases. I'm a low mileage driver. However, I have a feeling that will change with these tires. I wonder why they chose such a poor tire on a flagship car and / or provide standard tire options.
 

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But the tires on the Q50 are called "Dunlop SP Sport 5000 DSST CTT" at 245/45RF19.
The tire on tirerack are "Dunlop SP Sport 5000M DSST CTT" and are NOT offered in 245/45RF19.

These could be completely different tires. What is the difference between 5000 and 5000M?
How come tirerack doesnt have the size of 245/45RF19?
 

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According to Dunlop's website, they do not make this tire size in the 5000M. They do make it in the 5000. Can we confirm wheel size width and tire Infiniti is shipping with the car.

The only Dunlops in the OP's tire size are these of which the 5000 (not 5000M) is mentioned and only one of two run flats.

Dunlop
 

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Tires on the Q50S Hybrid RWD I saw is called "Dunlop SP Sportmax Q50 DSST Ctt". Not sure if they use the exact same tire as the one in tirerack "Dunlop SP Sport 5000M DSST CTT" and just rebadge it. It could be the same or completely different tire, who know.
 

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Tires on the Q50S Hybrid RWD I saw is called "Dunlop SP Sportmax Q50 DSST Ctt". Not sure if they use the exact same tire as the one in tirerack "Dunlop SP Sport 5000M DSST CTT" and just rebadge it. It could be the same or completely different tire, who know.
Ultimately I'm not sure it matters since pretty much every RFT get's really bad user reviews.
 

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Discussion Starter · #9 ·
First the tire size is:

Sport (all-season tires)
19 x 8.5-inch, triple 5-spoke aluminum-alloy wheels with 245/40R19 all-season run-flat performance tires

Sport (summer tires)
19 x 8.5-inch, triple 5-spoke aluminum-alloy wheels with 245/40R19 summer run-flat performance tires

This is the same size on the BMW 5-series. Here is a thread: **Consolidated RFT Failures/Issues Thread**

Typical post:

Quote:
New here, driving 550I with M package and the Dunlop tires on it are terrible. They need to be replaced and I was curious if anyone had any idea on what to turn to?
If you want to keep RFT tires then get Michelin Primacy. If going with normal tires then Michelin Super Sport.
If you think the Dunlop SP Sport 5000 DSST CTT is a fantastic tire...keep them.

Within a year there may be runflat Michelin PSS ZP tires; they are on the Corvette in a size different than the Q50. Otherwise, they are all junk and/or outdated.

In reality, few street drivers really tax the tires. The shock settings are often softer to compensate for the RFT's firm sidewalls. Those firm sidewall often give the appearance of sharp steering response.

Even in the non-runflat version, the Dunlop SP Sport 5000 DSST CTT is considered junk.:

http://www.tirerack.com/tires/surveyresults/surveydisplay.jsp?type=UHPAS

The PS AS3 will be the top rated tire in the category when their are enough reviews to qualify it. There are none so far.

The PSS is universally thought to be the best summer high performance tire. Tire Rack tests. Tire Rack surveys. Tire Rack reviews. Car and Driver review. Ferrari engineers. Corvette engineers. Of course, you can have your own opinion.

The risk, especially with non-adjustable shocks, is that the shocks will be too soft for a non-runflat tire. BMW owners haven't reported that as a problem but do report non-runflats ride much smoother. Many would prefer a stiffer shock with their non-runflats.

As I said at the top, runflats provide just a little driving distance at a great cost in tires and wheels. BMW owners have further been stranded for days waiting for a tire. Or have had to trek 200 miles round trip to retrieve their car when a tire became available.

The Q50 has a great strength with its space saver spare. Further, an inflation kit with sealant or with sealant and plugs gives the option of recovering the original tire. You should have that even with a runflat.

IMHO Nissan made a major mistake using runflats. Further, they compounded it with the 245/40 which only has a 3.8" tall sidewall. On the BMW forum the 245/45-18 tires reported none of the blistered sidewalls and resulting failures of the 245/40-19s. Some brands have the problem more than others.
 

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I have been running Hancook 215/55/17 Ventus V4 ES tires on my G and like them lots. The same tire comes in a 225/55/17 but is rated for a 7 inch width rim. Not sure what happens if these are put on a 7.5 inch with rim.

One thing I am sure of is the price is not $1000 for these.

I also see hancook makes some 225/40/19 tires in their Ventus R-s3 and Ventus V12 line.
 
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Discussion Starter · #13 ·
Tires on the Q50S Hybrid RWD I saw is called "Dunlop SP Sportmax Q50 DSST Ctt". Not sure if they use the exact same tire as the one in tirerack "Dunlop SP Sport 5000M DSST CTT" and just rebadge it. It could be the same or completely different tire, who know.

The Sport Maxx tires are not Ctts; they are summer performance models. They are on the GT-R and BMW models.

Really doesn't make much difference. None of the Dunlop Sport Maxx tires are very good or Sport anything are tires you'd go out and buy unless you had to. The Direzza and no Direzza II are the Extreme performance tire. The Direzza was king of the hill for years. The PSS supplanted it. The Direzza II didn't unseat the PSS.
 

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Trunk space in the hybrid is the reason for the run flats.
A major mistake. I'm sure that number 1 owners complaint would be the run flats.
If that was true, why not just put the run flats on just the hybrid?
 
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