The smallest pit bikes, like a 50cc can go about 25 mph (or considerably less if they may have a limiter), while the fastest versions can go 60+ mph. The top pace predominantly depends on how potent the motor is and just what the transmission and gearing are build for. https://andresmbrzf.blogaritma.com/36008517/indicators-on-go-off-road-barnsley-bikes-quads-you-should-know