Tire temps have been an issue from day 1 in this game.
After hundreds of online races, and now beginning to do lengthy single player races, I’ve figured out what works for with tires.
My default is to use Soft Tires for everything (this is mostly GT3 and GT4). The only time I use hard tires is if the track temp (not ambient) is above 30’C, and even then, only on some circuits.
Circuits with high load corners, such as Watkins Glen, Sonoma, Brno, Silverstone, Road America, COTA, Hockenheim, Algarve, Dubai, etc, these are where I’ll use Hard Tires above 30’C. Circuits like Monza, Imola, Long Beach, Zhuhai, Bathurst, Daytona, Fuji, etc, I’ll usually run Soft Tires unless it’s like 50’C track temp. Even then, at Monza, it’s softs all day every day.
The only issue I ever have with tires is overheating the loaded front tire. Never have any issues with the rear tires, other than sometimes they’re too cold.
In all my miles, I have noticed the tires, across almost al catagories, follow a bit of a pattern. Perhaps a bit realistic, but imo they over simplified things for the game.
Basically, it goes like this. Lap 1, everything is a little bit greasy. Not a lot, just a bit. By lap 3, once temps are up, you get maximum grip from the tires. From lap 3-6/7ish, things start to get really greasy. In most online races, this is where most people lose it, crash, then quit. After lap 7/8, with some fuel burnt off and rubber layed down, the tires come back to you, and you get near perfect grip levels for the last few laps.
I just did a 30min Super Trofeo race last night, same pattern. Little greasy, good grip, very greasy and slick, great grip to the finish.
The middle stage where the tires temporarily go off, this is the key phase of the race. If you can maintain a reasonable pace, but more importantly keep your tire temps in check through this phase (very easy to over drive and cook the fronts here), then the second half of the race becomes a breeze.
I’ve noticed the exact same pattern, online and offline, short races, long races, on both the hard and soft tires.