Your height: 5 to 10 year old / 5 à 10 ans approximatly (?).
Frame size = Roues 20 po / 20in wheels
Comments:
1 speed bike looks a lot like a BMX. Handlebar is high and wide
1 speed: for traveling short distances in a mostly flat neighbourhood. If you can walk there in 30 minutes, it should take around 6 minutes by bike. Not good for going up hills, even low grade climbs are hard. - Derailleur:
Tires 20 x 2.125: wide tires, deep thread, all terrain.