Gear ratios fixed

Someone knows why GTE and GT3 cars have fixed gear ratios.
the porsche gte has only one long march for le mans

 

GT3 gear ratios have no options because of FIA rules for the class. IMSA GT3 cars are allowed one of three differential ratios depending on the track, but IMSA rules were not modeled in rF2.

 

thanks, GTE cars have fixed gears for a BOP issue in rf2