@Nicola59 Thank you for the Report, it saves me the Time to test it. Maybe it has to do with the Compound that is set for FrontTireCompoundSetting= and RearTireCompoundSetting= in the HDV File, in Combination with the used TBC. Maybe this Effect only appears, when in the HDV another Compound than 0 is set for these 2 Values. They probably work only, when the Car joins the Track for the first Time and if it, for Example, is set to 2, the Car starts with Compound 2, but then, whenever a Pit Stop happens, loads the first Compound (usually 0, if that is no wet Tire). At least that is/was my Suspicion.