I started out getting hard rubbish bikes for my three year old last year. Now I've got a shed
full of adult hard rubbish bikes!
For young children still trying to learn on training wheels (a hindrance to some childrens natural balance), try picking up a cheap 8"-12" wheeled kids bike and removing the complete crank/pedal/bottom bracket set, and lower the seat so they can put their feet on the ground, and
VOILA!, you've got yourself a 'balance bike'. Just remember to start them on a flat area, unless they have brakes they can
use!
My son at 2 1/2 years old took to a 10" balance bike whilst we were still in the bike shop umming and ahhing about whether to get the 10" or 12" version. "I want this one!" he said, freewheeling up and down the aisle, feet in the air!!
He has since progressed to a 12" hard rubbish 'bitsa' pedal bike for about a year, and now he is four months into riding his 4th birthday present - a new Apollo Wizard aluminium 16" bike! This seemed to be the best 16" (spec and price) we could find on the local market, with a very low standover height.
'Dadda' has already upgraded it with lighter, shorter handlebars and stem, stiffer, lighter v-brakes (he seldom uses the rear coaster brake), grippier pedals, and faster tyres, all sourced from hard rubbish (I must weigh it tomorrow)! He still manages, and enjoys, at 19kg, to travel in the Beto child seat occassionally for 'quick' trips, the hardly-used trailer is collecting cobwebs (waiting?), and we have just discovered the joys of a
'TrailGator'!
As for the shed full of bikes? Hmmm... too many projects..... plenty of time on my hands.... not enough
cash flow!
EDIT/PS: I didn't start riding two wheels till I was about twelve. My nearly 50 year old sister has never ridden a bike.