they do , you must be refering to a bag of **** pitbike (foxico) or a very poor rider mine pulls 55k's in 3rd no worries , pocket bikes a designed soley to go fast and many are hard tails so there is no upward or downwards movement as there designed for slick roads.Pit bikes are designed for more than just speed they have to handle offroad terrain ,jumps ,ruts ,berms ,sharper corners etc