we were running 5800 brushless motors with the 19 turn class with the standard rotors and they were pretty close in top speed(just a tic faster down the straight) but the drivability of the brushed motors always put them on top.with the new sintered rotors,the 5800 stomps a mudhole in the 19 turn brushed motors.now we need to do a seperate brushless 5800 class.