Because bike outings leave lifelong memories, SousseBikee offers mountain bike rental for children. The most important thing is to choose the right size and ride young! From 6 to 9 years old - Child between 120-135 CM: we recommend a 20 INCH children's bike From 9 to 12 years old - Children between 135-150 CM: we recommend a 24 INCH children's bike. Above 150 CM, we recommend an Adult MTB in size S