After measuring, you can refer to a bike size chart (as provided in this article) to find your child's suitable bike size.
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Pics. So if your child is 4, look at the chart and see what is the bike size for a 4 year old. The best indication of which size is right for your child is how comfortable they feel on the bike.
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The best indication of which size is right for your child is how comfortable they feel on the bike. The last thing you want while riding is bumping your knees on the handlebars because your bike is undersized, or not being able to pedal smoothly because your bike is a bit too big. Not only will the right size bike offer the most comfortable ride, it will also let you get the best performance out of your bike.
Over the years, there have been a lot of new kid atvs, and some of them are better than the others.
In order to accurately match the correct bike for your child, it's essential you measure their height accurately. Take your child to a good bicycle store and get them measured. A kids bike size chart is your starting point. So, while kids bike sizes are indicated by wheel size, wheel size alone is not a reliable indication of whether a bike will fit your young rider.