Did some more tyre testing and I can strongly advise not to use the medium tyre ( except for Jeffrey, you can use it
)
Tried to do a 21 lap stint and after around 5 laps the rear got yellow, not too bad but around lap 8/9 I started to lose about 0.5 - 1 sec compared to my best time.
Around lap 12 or so the rear tyres turned red, after that I was keeping my eye on the my other tyre app ( which just shows the exact percentage of grip, yellow is <98 and red is <96 )
At lap 17 it all went to hell. The tyres started to pass the treshold below 94% and that just means the tyres is completely done. No grip whatsoever and the percentage is dropping really quickly ( think I lost 2% in lap).
After trying to complete 2 laps more I just gave up with the rear tyres at 89% and several spins.
After that I tried a few laps of the hards but to my surprise they were pretty good. Abit more understeer but that makes the car abit easier to drive. So after 7 laps I almost beat my best lap of the mediums and the tyres still at around 99% I called it quits.
So unless your good at conserving tyres ( which I'm very bad at
) I don't think they are gonna last a full race.