Hi there, childrens bikes are measured on their whee; size, not frame size, so this information is not available. However, I would recommend that a 16 inch bike is suitable for riders aged 5 to 7 years, with a height of between 3' 7" and 4' 0" (110cm 120cm). The Ridgeback website unfortunately does not give details of the weight of this bike, but in my own experience I believe it to be one of the lighter childrens bikes around.
I hope this helps
Ben
Wandsworth store