I just buy Parma tires, which they say are the same foam and rim except for that they are black rims. Yellow, orange, pink, and others can still be bought from Ashford Hobby, just got 3 sets of yellow rears from them in the mail, but they were Parma, not explicit Jaco.
I race toy cars for fun. If I need to explain, you'll never understand.
If everything is under control... go faster.
WTB: Carpet racing in Arizona.
It is obvious and intuitive to the most casual of observers that RC racing is better than golf.