Losing the training wheels was super easy for us. We gave my son a Skuut (wooden balance bike) for his 4th birthday, once he had mastered his trike and wanted more speed. It didn’t take long at all for him to master balancing on it and he’d zip around the neighborhood and park like mad. For his 5th birthday, we bought him his first “real” bike. The training wheels were on for the first two weeks, so he could get the hang of the weight of the bike plus pedaling and steering it. Then we took off the training wheels, and it took one afternoon of running alongside him down the sidewalk, which has a slight decline, and letting go bit by bit. Once he got over the fear of my husband letting go, it took about 2 more trips down the sidewalk before he wanted to go the school playground and he was off, with a total s***-eating grin on his face. It was beautiful.