My daughter has sparkle and glitz 12 inch bike with stabilizers (training wheels). Since we purchased the bike every now and again the back wheel keeps spinning when she is pedaling. This seems to happen more when there is a bit of an incline. Any suggestions what problem could be?
The stabilizers are taking too much weight. This can happen if they are mounted too low, or she is leaning too much and transferring weight off the rear wheel.
The first problem is easily fixed - the bike should lean slightly to one side or the other. When its held upright with all the weight on the back wheel, the stabilizers should be about 1-2cm off the ground (Higher for rough ground).
The second is teaching her not to lean on the stabilizers. This can take some time and effort, especially with younger children. It is well worth investing time now to teach her to ride upright than later, when she has learned bad habits.
I regret using stabilizers on my boys bike. I now believe they hinder progress as the kids get used to them, and prevent them learning proper cornering (as the bike cannot lean). They probably cause as many crashes as they saved with my boys. If I did it again, I would buy a balance bike, (or remove the pedals and cranks) and get them balanced, then add the pedals.