I have done some searching but to no success. I am always hearing people ask "what is the top speed of such and such bike" I have always wondered how fast 0-60mph or 0-30mph, 1/4 mile times of a regular dirt-bike. 250cc (2-stroke)/450cc (4stroke), 125cc(2stroke)/250cc(4stroke) Does anybody know how fast any of these size dirt bikes are? I know some bikes only have a top speed of 60mph or so. Maybe 0-30mph instead? Any guesses?