I ran it all day long and didnt break anything. This truck is amazing, I let a guy at the track drive it and he wants one.
The stock tires worked on the hard packed clay track in reo indiana also, I had almost too much traction.
I switched to my Losi pink tapers and it drived so much better though.
I'll save the stock tires and black rims for loose dirt, which I think that's what these tires are designed for.