I was one week over 4 when I learned to ride without training wheels... I did it the day after my sister (almost 6) did I only vaugely remember this.. or riding with training wheels. There was no "learning" - I just decided to DO it one day, and I did.

My oldest kid, he was riding without training wheels at 3 years and 4 months. I wish I was joking/exaggerating, but I'm really not.. we had taken the training wheels off his bike to discourage him riding in the house, and it wasn't but 2 days later that he completely TOOK OFF riding on his bike pushing the pedals.. we were shocked.

There are no sidewalks or anything where we live.. he actually learned to ride inside! he was able to ride in the grass right away though, we just hadn't really tried it much because it wasn't easy with the training wheels.

My younger two have had the advantage of balance bikes.. so they learned to balance/glide from an early age. My 5 year old *can* ride with pedals, but she is absolutely terrified of it and refuses to do it. My 3 year old.. honestly if we could FIND a bike tiny enough with pedals he'd probably be riding without training wheels... but he'd need a bike with 10" wheels (he is TINY.. 12" bikes are too big) and those are few and far between