In the star wars universe the speeders bikes was almost as fast as the pod racers went. Example the 74-Z speeder bike, had a top speed of upto 500km/h, where the pod racers went upto 900 km/h, but only at max speeds
Quoted from the wiki: "Because of the reflexes needed to control the pod as it raced around the course at breakneck speeds, as well as the dexterity needed to control the Podracer, all known Podracers, apart from Anakin Skywalker, were non-humans. Inhuman physical attributes, as well as extra pairs of hands, came in handy when trying to control the pod at its top speed of around 900 km/h."
Seeing that the storm troopers were so poorly trained that they could not even hit simple shots with the blasters, how could they manage the speeder bikes?