The smallest pit bikes, such as a 50cc can go about 25 mph (or much less if they've a limiter), although the quickest designs can go 60+ mph. The top pace predominantly relies on how strong the engine is and exactly what the transmission and gearing are set up for. https://electricunicycleuk19517.designi1.com/58816300/new-step-by-step-map-for-uk-electric-unicycle