Not 1m10s on SM, but on CM and much over 1m10s. If I wrote it wrong in my post, my mistake.
Ah, sorry. The post said "sport medium" but I should've figured out that was a typo given that you were talking about the tire classifications in the OP.
The only thing I really disagree with here is trying to compare GT lap times with real life to justify any argument, because it's just pointless. I used to do this a bit myself and loved comparing my GT times to real life with GT5, but with GT6 it's a waste of time. The so called 'improved physics' have left us with broken drag modeling meaning that road cars accelerate way too fast up to crazy high top speeds compared to their real life counterparts, whilst race cars with significant downforce are much too slow in a straight line. Until PD shows some interest in fixing this, there's no point in getting serious with game vs real life comparisons.
I guess if you just have to then Tsukuba is a better track than most. Short straights meaning the drag problems are not that significant and there's lots of real life times that were set there in many different cars by Best Motoring.
I agree that there are discrepancies in the acceleration and top speed of cars in game compared to in reality, but I cannot agree that these discrepancies render lap time comparisons "pointless." While the discrepancies need to be taken into account, they don't render the use of lap times impossible. For example, if we know that road cars accelerate faster in-game and a set of Comfort Medium tires yields lap times in the 1:10.5 range for a car that ran in the 1:08.6 range in real life, it's pretty obvious that the Comfort Medium tires are not providing a level of grip that accurately simulates the stock tires' real-life grip. Similarly, if Comfort Soft tires allow lap times around 1:08 flat, it's reasonable to take the opinion that the Comfort Soft tires are coming at least roughly close to simulating the grip level of the real-life tires.
If SH tires are non-legal, does that mean PD chose the wrong default tire for the supercars? Like I said before, there's no way you can properly drive a TVR Cerbera Speed 12 on Comforts. Even a Shelby Cobra is ridiculous on Comforts. If SH is an illegal tire meaning you can't daily drive it in summer, then why don't Corvettes, Vipers etc come with Comforts in the game?
The Shelby Cobra 427 is ridiculous on street-legal tires in real life too. People who raced it described the driving method as never touching the gas unless you were going straight.
The Cerbera Speed 12 actually had its production canceled because the people building it decided that it was impossible to drive the car safely on street tires. The owner of the company drove the car, decided it was completely unusable on the road, and cancelled the project even though that meant refunding several deposits that had been made for the car. So it's actually accurate for the Speed 12 to be essentially uncontrollable on street-legal tires.
As for why some cars come with Sport Hard tires even though those tires don't accurately reflect the OE tire's grip, well, GT6 is a game. And as such, it has to make some trade-offs to make the cars more accessible and fun for players.
For example, I test a lot on Streets of Willow because it has excellent corner variation and a huge amount of real-life lap times available from a very good driver (Randy Probst). With the C4 Corvette Grand Sport, completely stock and without even so much as an oil change, I ran a 1:19.274 at Streets. The fastest time for a stock street car at the real-life track is a 1:19.55 by a Nissan GTR. Even accounting for the in-game Grand Sport having faster acceleration than the real-life car, it's obvious that the stock Sport Hard tires are giving it way too much grip.
In all honesty, I think that the higher power cars come with tires that are intentionally more grippy than they would be in real life simply because if people bought the game and then had as much difficulty at the limit in those cars as there is in reality, they'd hate the game.
Haven't they been discontinued for almost a decade now and replaced with the brilliant RE011s? Anyway, strange thing the 10s have a lower Treadwear Rating than the 11s..
Tire Rack has some RE010s available for sale. It's possible that Bridgestone makes a small batch every few years to satisfy the OEM crowd.
The RE-11 is an "Extreme Performance Summer" tire, which is a couple steps up from the RE010 according to Tire Rack. The RE760 is a better modern comparison for the RE010.
Treadwear rating isn't really a good measure of grip once you're comparing tires with treadwear ratings that are within 100 or so of each other. As construction techniques and rubber compounds improve we get tires that are both more grippy and longer-lasting.