My buddy and I did a Kyosho Inferno GT. Running a Neu 1512 1900kv motor on 5S with a Compro 16016 and GRP Rally tires, we had it over 90 mph several times. What was impressive is that we also wiped out several times at speeds in excess of 90 mph and we never broke any parts on the car. I'd have to say that it's pretty tough.