The new training-wheel attachment system is difficult to install. Certain REV 12, 16, and 20 Kids ... 4 cannot accept training wheels, but you can remove the pedals and use it as a balance bike ...

Recessed hardware at the wheel hubs ... usually around 4 years old, depending on your kid. Some children can ride a 14-inch bike up to age 7. It weighs 12.5 pounds without pedals and 15.5 pounds ...