The kyosho m3 evo drivetrain is about as free rolling as it gets for a 8 scale car out of the box. It feels like it has ceramic bearings. Much better then the mrx4x and 966 drivetrains I had both cars cars. However the mrx4x has a tank almost unbreakable!! And clutch on the 966 seemed to have the most punch. But the kyosho was faster on and off power to me. I just put the mugen clutch on the evo and I love it!!!!!!!