I would personally go for a foam spec car. The thing is that if you run foams a rubber tire car will have too much flex. The thing is that with a very weak Anti roll bar a foam car can run rubber tires fine. I have found that the opposite is not true and rubber tire cars are not stiff enough to run foams, even with stiff anti roll bars and hard springs.
Not sure you understood my question. I'm getting another losi jrxs-r (no foam/rubber spec) and my question was which is more important to have a fresh car.
the losi JRXS type-R does not have a rubber or foam spec chassis.there is only 1 chassis. the car works great either way with a stock setup.just change minor things, such as springs, shock oil weight etc.
marc davila aka... marc ups.... drive it like you stole it.