Don't dislike the Tamiya foam tires(HBR soft and HBR medium) but they are hard to get here and cost a lot.
I pay about 20 euro's for a set foams front and rear for GP speed tires.
If i want to use the Tamiya tires it will cost me about 35 euro's for just the foams
Rubber for the F103 is even more expencive
Using Pit's for the rain and/or carpet.
For tarmac i use foams.
I have loaned a CRC shorty lipo to use in my F103 and F104.
Works great
regards Roy