if you plan on racing, you don't need to worry about going 50-60 mph...and depending on what tracks you plan on racing at most have limits to what size motors you can run (unless it's an open class)...don't know many club tracks that are big enuff to go 50-60mph...all our classes at my track are open classes..so u can run whatever you want in your trucks/buggies..but nobody at our track has vehicles that go as fast as u are wanting to go..