When you’re shopping for a bike, make sure to take into account the child’s height and width. Most bicycles are sized according to these measurements. When in doubt, always consult with your child’s pediatrician or an experienced bike retailer. Here is the Kids Bike Size Chart:

Kids AgeKids Size (Feet)Kids Size (cm)Bike Size
2 – 5 years2′ 10″ – 3′ 7″85 – 110Run bikes
2 – 4 years2′ 10″ – 3′ 4″85 – 10012″ wheel diameter
5 – 7 years3′ 4″ – 4′ 0″100 – 12016″ wheel diameter
7 – 9 years4′ 0″ – 4′ 5″120 – 13520″ wheel diameter
9 – 11 years4′ 5″ – 4′ 9″135 – 14524″ wheel diameter
11+ years4′ 9″+145+26″ wheel diameter
Kids Bike Size Chart

Also Read: How Are Kids Bikes Measured?

Kids Bike Size Chart

How to measure a child for a bike

Measuring a child for a bike can seem daunting, but with a few easy steps it can be conquered with confidence! The two most important measurements when sizing a bike for a child are inseam and height. With these two numbers, you can easily find the right bike size for your child.


The easiest way to find the right size bike is to match it to your child’s height, as this will determine the size of the wheels and frame. The best way to measure your child’s height is to stand them against a wall, mark the height with a pencil and then measure from the floor to the pencil mark with a tape measurer.

Here is a general guide for kids’ bike sizes by height:
-For kids under 5 feet tall, look for 12-inch or 14-inch wheels
-For kids 5 feet tall or shorter, look for 16-inch wheels
-For kids 5 1/2 feet tall or taller, look for 20-inch wheels


The inseam is the most important measurement when sizing a bike for a kid. The inseam is the distance from the bottom of their foot, up the back of their leg to their crotch. To measure a child’s inseam:

– Ask them to stand with their back against a wall and their feet about shoulder-width apart.
– Place a book or ruler between their legs at their crotch, making sure it’s pressed firmly against the wall.
– Have your child hold the book or ruler in place and then measure from the top of the book (or ruler) to the floor. This is their inseam.

Kids Bike Size Chart: Different Bike

When you are choosing a bike for your child, it is important to get the right size. This kids bike size chart can help you find the perfect bike for your child. The chart includes measurements for both boys and girls.

Balance Bikes

The majority of kids bikes sold nowadays are 12-inch or 14-inch. These bikes usually come with training wheels, and some can convert to a pedal bike. If you have a tall 3- or 4-year-old, you might want to consider a 16- or 18-inch bike.

And even if your child is not quite ready for a two-wheeler, they might enjoy riding a balance bike. These look like bicycles without pedals and provide kids with an easy way to get accustomed to the feel of riding on two wheels.

Training Wheels

Training wheels are an extra set of wheels that attach to the back and front of a bicycle. They provide support and balance for kids who are just learning to ride. Many bicycles come with training wheels, but they can also be purchased separately.

Once your child has learned how to ride a bike without training wheels, you can remove them. This usually happens when kids are between the ages of 5 and 7. Some kids may be ready sooner, while others may need a little more practice.

Pedal Bikes

Choosing the right size bike for your child is important. If the bike is too big they won’t be able to reach the pedals and if it is too small they will be cramped and uncomfortable.

Use the following chart to help you choose the correct wheel size for your child. The child’s height is a good guide to wheel size, but if you can, try to also test ride the bike before you buy it.

Bike type Approximate age of child Wheel size

  • Pedal bike 3-5 years 12 inches
  • 5-8 years 16 inches
  • 8-11 years 20 inches


In summary, the best way to find the right sized bike for your child is to:

  • Measure their inseam.
  • Determine what size bike they need based on their inseam measurement and the size chart above.
  • Ensure that when they are sitting on the bike, their feet can touch the ground.
  • Make sure they can reach the handlebars comfortably.