255/40 R17 Tires

I had them installed on my Mercedes C350 RWD size 255 40 ZR17 94W on the rear axle.
DOT 1K2 UTQG 400 A A (made in Vietnam)

I`m a spirited driver and use the potential of my 272bhp often.
Drive every week on the german autobahn with +200km/h.
Grip on dry roads is very good,noise level top.
Wet roads also grip level is good
Like the performance of these tires.
Will make review after 10K miles

They replaced Bridgestone S001 245 40 R17 91W.
These lasted 20k km (approx. 12500 miles)

Staggered set with Dunlop SportMaxx TT RFT on Front.

I drive across Germany into Poland every winter, so required a snow rated tire for my 2003 BMW Z4 3.0i. After fitting I went for a test drive, sub 8°c and wet. They felt like what I imagine a qualifying tire feels like compared to my summer ContiSport Contact 7s, which noticeably lose grip in the cold.

The rain was very heavy when I left Euro tunnel in France, and became near biblically torrential in Germany. The Sottozeros felt like I was driving on warm tarmac - no exaggeration whatsoever. The rain completely overcame my windscreen wipers at points causing me to slow, the tires gave me no reason to slow. At very high speeds there was a sense that they weren't able to clear the surface water entirely, but at 90mph felt solidly connected to the road.

On the return journey, we went via Quedlinberg where it was snowy, icy, and the roads were ungritted. I had to slow for this as the car was sliding and I was too tired to enjoy it. I doubt anything other than a spiked tire would have been any use in those conditions.

I've done this trip twice now with the tires, plus daily driving as I fit them as soon as the temperature drops consistently below 9°c, roughly 4,000 miles, with no observable wear yet.

I would never be without a tire like this in winter now, even in GB where it is not mandatory. They clear surface water like nothing I've ever experienced before and don't just feel safe in extreme rain, but actually enjoyable.

Due to the odd/rare size of the rear tires fitted to my car (a 2010 330d), their was only a choice of 2 decent tires, these and the even older Goodyear Asymmetric 2s.
Compared to the A2's I had before the PS4 is a revelation in the wet, the grip in the wet was absolutely staggering (above 7C, below which any summer tire will increasingly struggle), it felt like it almost matched the A2s grip in the dry! Truly amazing grip in the wet!
Grip in the dry seemed good too, although I never pushed them cornering.

A big downside though was the rate they wore at, I nearly got caught out hitting the legal wear limit (1.6mm), I usually change tires at 2.5mm.
Although this was partly due to my mileage shooting up that year (due to a job change), it was also down to how quickly the tires were wearing, from new to ~1.6mm (for the NSR, OSR was ~2.7mm) in about 13.2 k miles. Whereas the last set of GY A2s lasted ~18.6k (rears again).

Their is the mitigating circumstance that I found the rear tracking was out shortly after replacing them, by how much I don't know because the garage's printer wasn't working and they didn't bother to take a photo of it either! That said, it was tracking straight and the outer and inner edges and groves had worn similarly, although the rear was tramlining somewhat (which reduced quite a bit after having it tracked).
Also it seems that the factory pressures are too high for the rears making them wear more in the middle, see their final tread depths below (for each main groove) and make your own mind up. But certainly the A2s pumped up to the same pressures and likely the rear tracking had been a bit out for years as the rear tramlining issue (mainly on the concrete bit of the south part of the M25!) had also been around for years!
NSR 3.2, 2.4, 1.6, 2.7
OSR 3.5, 2.7, 2.7, 3.5

Since then I've fitted Goodyear Asymmetric 6s (I had to downsize slightly to 245/40 17 to get them), and actually their not faring much better :(, they've covered 12.6k miles and are down to 3mm in the ctr grooves already (I can't recall what the outer's were, but theirs a smaller difference than the PS4s, which is at least partly down to the slightly lower pressure I use now, 2.5 Bar vs 2.7, not to mention the tracking being done at the beginning of their life).

i’ve driven these tires on the rear end of a ford falcon ute, and even with the horrible weight distribution of these falcon utes these tires perform pretty well, have gone about 210kmh in these wheels and they still felt extremely stable when changing lanes, with grip i’ve been happy too with going on hill runs and twisty roads at an average speed of about 110kmh thru corners on the wet and i’ve pushed these tires to over 160kmh on some other corners and the rear end still grips well with the factory lsd diff. tire wear has been alright too (been driving it extremely hard almost daily and haven’t worn out near as much as previous tires i’ve owned). can’t comment about tire noise as my cars way to loud haha. oh yeah and i’ve down a few burnouts and skids in these tires and holy f*** do these things have good wear there’s been times i’ve though ive wrecked the tires and they still look as if no skids where commited. will buy another pair.

After two seasons and around 10k km with moderate driving rear tires were left with 6mm.

Rs4 gives amazing grip but only in the most ideal conditions. Getting temp into these tires is quite difficult, but once warmed up they grip very well. The grip is predictable but certainly not the best. Works very well in sunny weather. Cooler weather or rain makes it more difficult. Speaking of rain, this is not an all season kind of tire so can't expect the best traction from this set. The sidewall is stiff and gives great response and feedback, but high road noise as an unfortunate compromise. The stiffness does compound if you run a higher spring rate or high dampening but can be OK as an all season however not recommended. Wear on the tire is very good, long lasting with this harder compound. Don't expect comfort but this is a good track or weekend mountain carving tire.

I’ve had Pirelli, Bridgestone the lot and I always come back to landsail. Great tire. I drive an Alfa Romeo so drive hard into corners and hold the limits where I can. They are responsive and hold the road really well. They don’t sag or roll. Grip is very good in dry. Wet is good also. Not sure why they are reviewed as average.. bizarre. I think they are amazing value for money. To the point you can replace every 8000miles instead of having to try and ekk out every last mile on premium brands.