Une précision très importante. Cela dit, je ne comprends pas la dernière ligne...
Tyre performance rating:
Shows how much influence tyre has on car speed. 100% is fastest, 98% is slowest.
98% tyre is 2% slower than 100% - 2 seconds per lap slower on a 1:40.000 lap
98.0% performance is old 30% value
98.2% performance is old 40% value
...
98.8% performance is old 70% value
...
99.4% performance is old 100% value