2019-6-26 · The adult Go-Karts travel up to 12 mph. Don't worry, kids you can ride them too - all we require is that you are 54" tall to ride alone or 36" tall to ride free with a paid adult! The Kiddie Go-Karts work for those 36 - 54". They run on a separate 300 ft track at up to 5 mph and offer an automatic brake system for added safety.