The smallest pit bikes, for instance a 50cc can go about 25 mph (or significantly less if they have got a limiter), although the quickest types can go 60+ mph. The highest speed largely depends on how powerful the engine is and what the transmission and gearing are create for. https://surronframe34050.ttblogs.com/17788835/new-step-by-step-map-for-uk-electric-unicycle