Well, I know for sure it is not racing soft as one of my Zondas doesn't have those. It's either racing hard (my guess would be those) or sports soft. I used both of the cars in B-spec and I think I bought the sports soft so they could compete in the Supercar Festival. That would mean the standard tires are racing hard... but I am not 100% sure.
On a sidenote: You live in Bathurst, as in the city with the track? I've been playing quite some S2U for the past months and that track is absolutely amazing. Did you ever drive there (is it even possible?)?
Yea it is possible, there are actually houses situated around the track. Its a 2 way road normally and speed limited to 60km/h. and yes, I have driven around it and boy is it fun. Its quite a decieving track. Its looks alot narrower then it actually is.