wet tires

While playing in driver career mode I was race in a f2 race at Silverstone that had started out drizzling so, the game made everyone use wet tires. By lap 7 the rain was gone and in my race plan I saw it would clear up so I scheduled a pitstop thinking I would be able to change my tires. When I got to there pit they just put wet tires back on and I had no choice to change.