Pedal cars with adjustable frame length

 

— the ability to adjust the length of the velomobile frame is considered one of the most convenient options for turning a car from a “children's” into an “adult” and vice versa; it also provides additional options for adjusting the position of the steering wheel. However, an adjustable (that is, in fact, a composite) design adversely affects reliability, which means that it requires the use of stronger materials than a solid one; and in general it complicates the car and increases its cost. Therefore, this option is relatively rare.