Best Razor Mini Dirt Bike Reviews Of 2017 Top Guide The speeds a mini dirt bike can reach are impacted by 2 factors: the output of the engine and the weight of the rider. Most mini dirt bike models feature a 49cc or 50cc 2-stroke engine. This is roughly the same size as a motor you might find on a chainsaw. Generally speaking, gas-powered dirt bikes reach 22 to 25 miles per hour while electric dirt bikes top out between 12 and 17 miles per hour. This makes electric ideal for beginners since the speeds they reach are controllable and easy to handle. We suggest some experience operating dirt bikes before moving on to gas-powered machines, although our tests showed that beginners were generally comfortable with the speeds they reached. For More Information Visit http://minidirtbikers.com/