Sort of a useless place for this information to be, but anyway...
I just finished doing an Arcade Mode race to test this tire-swapping business. It was 10-lapper (although I never finished the race) in an M3 on El Capitan, but the specifics shouldn't matter, nor should the game mode. Some of the details of the results surprised me, but the basics support what I've been saying, along with Open Addict and sukerkin. Being Arcade mode, I obviously couldn't attempt a change to racing tires, but I'm certain that doing that would have yielded the same results.
First off, I started with S1 tires, then pitted on the first lap to swap to N1s. I did another full lap, and the tire wear and performance were the same as on S1s. So changing tire types is impossible. Then I confirmed this result with a race starting on S3s and swapping to N1s. I definitely didn't get N1s; instead, I got S3 performance again, to my surprise. Still no changing of types, but I was wrong that you get the closest tire to what you started with. Then I did a final race starting on N1s, and did several tire swaps in the race, which I've probably got in the wrong order now, but the basics should be the same. I did a lap on N1s and swapped to N3s, and definitely got N3s. Then I tried changing to S3s, and got (surprise again) N1 performance. A lap on those, and then a change to S2s, and N1s were again the actual tires on the car, demonstrating that you can't change tire grades within a tire type even when they're mislabeled (remember, entering each pit stop, it shows me having what I tried to select on the previous stop, even when performance indicates I definitely didn't get them). Finally, I tried to switch to N2s, andagain got N1 performance. Edit: Oops, I forgot that when I went to N2s, I actually did get N2s.
The conclusion I come to is that whatever tires you start on, you can change tire grades within that tire type, and if you try to change to a different type (N, S, R) you will get the exact tires you started on. So if you begin with N1s, you can change to N2s or N3s, but no matter which of those you are running on when you attempt to change to S2s, you will get N1s again.
I hope that clears things up. Parnelli, I honestly cannot account for your results, unless you did something crazy like start on S1s, later change to S2s, and try to finish the race on N1s (in which case you would have gotten S1s again).
I just finished doing an Arcade Mode race to test this tire-swapping business. It was 10-lapper (although I never finished the race) in an M3 on El Capitan, but the specifics shouldn't matter, nor should the game mode. Some of the details of the results surprised me, but the basics support what I've been saying, along with Open Addict and sukerkin. Being Arcade mode, I obviously couldn't attempt a change to racing tires, but I'm certain that doing that would have yielded the same results.
First off, I started with S1 tires, then pitted on the first lap to swap to N1s. I did another full lap, and the tire wear and performance were the same as on S1s. So changing tire types is impossible. Then I confirmed this result with a race starting on S3s and swapping to N1s. I definitely didn't get N1s; instead, I got S3 performance again, to my surprise. Still no changing of types, but I was wrong that you get the closest tire to what you started with. Then I did a final race starting on N1s, and did several tire swaps in the race, which I've probably got in the wrong order now, but the basics should be the same. I did a lap on N1s and swapped to N3s, and definitely got N3s. Then I tried changing to S3s, and got (surprise again) N1 performance. A lap on those, and then a change to S2s, and N1s were again the actual tires on the car, demonstrating that you can't change tire grades within a tire type even when they're mislabeled (remember, entering each pit stop, it shows me having what I tried to select on the previous stop, even when performance indicates I definitely didn't get them). Finally, I tried to switch to N2s, and
The conclusion I come to is that whatever tires you start on, you can change tire grades within that tire type, and if you try to change to a different type (N, S, R) you will get the exact tires you started on. So if you begin with N1s, you can change to N2s or N3s, but no matter which of those you are running on when you attempt to change to S2s, you will get N1s again.
I hope that clears things up. Parnelli, I honestly cannot account for your results, unless you did something crazy like start on S1s, later change to S2s, and try to finish the race on N1s (in which case you would have gotten S1s again).
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