Seriously, remove your child's training wheels, they are hindering the process of learning to ride a bicycle. Riding a bicycle consists of a few basic principles:
The most important of these principles is balancing and the least important is pedaling and with training wheels on a bike, a child only learns how to pedal ( and a few really bad habits).
It's all about balance. Without balance, a cyclist will fall over and won't have time to pedal, or steer, or stop. Unfortunately, when using training wheels, balance is never learned until after the training wheels are removed. If one learns balance first, everything elses will be a lot easier to learn.
Steering isn't learned when using training wheels? That's right. turning a bicycle left and right, especially at higher speeds, requires a cyclist to lean into turns. Since training wheels prohibit leaning over, a child will not learn how to properly navigate a bicycle.
Stop! The bike was moving and now it is not. What is the first thing a new rider should do? Put their feet on the ground. Because training wheels prohibit a bike from leaning over, one doesn't learn the importance of putting their feet on the ground when a bike is stopped and instead learns the bad habit of keeping their feet on the pedals.
A dandy horse
doesn't need training wheels; teach the dandy horse method.
By removing training wheels from a bike, a new rider will need to learn to use their own legs to keep from falling over and at the same time they will learn how to balance on a bike. For propulsion, the child can simply run while seated on a bike. I shouldn't have to say it, but I will for safety sake: avoid hills when teaching a child to ride in this manner.