In Paris and the Île-de-France region, cycling is becoming an increasingly common part of daily life. Families cycle along the banks of the Seine, in parks, or on the city's bike paths. Buying a child's first bike is an important moment, both for the child and their parents. Every parent wants to find a safe, comfortable model that can accompany the young cyclist for several seasons.
In practice, the task often proves more complex than it seems. Parents are faced with dozens of models, different wheel sizes, and several types of brakes. Advice found online sometimes contradicts itself, and it's easy to get lost in this abundance of information. Ultimately, it's not always clear which bike will truly suit the child.
In reality, choosing a children's bike relies on a few essential criteria: frame geometry, bike weight, component quality, and correct adjustment.
Cycling is a great way to spend time with family
A well-chosen bike makes family outings safer and much more enjoyable. The experts at the Routes and Roads shop have prepared this guide to help parents find the most suitable model based on the child's height, skill level, and needs. Routes and Roads' assortment includes a wide selection of bikes for various uses and budgets, including children's models. The team is also working to expand this range to better meet the expectations of young cyclists.
Table of Contents:
How to choose the bike size according to the child's height
Children's bike size chart
12, 14, 16 and 20 inches: what's the difference?
How to know if the bike fits
When to change bikes
Mistakes when buying a children's bike
Conclusion
How to choose the bike size according to the child's height
When it comes to choosing a bike for a child, the most reliable guide is their height. Age can provide an indication, but it remains approximate: two children of the same age can easily have a difference of more than ten centimeters in height, so it shouldn't be relied upon exclusively.
Manufacturers typically use wheel diameter to define bike size. Bikes are thus classified as 12”, 14”, 16”, 20”, or 24”. This parameter allows for quick identification of the appropriate category, but it's not enough to judge riding comfort.
When choosing the size, observe the child's position on the bike
Even with identical wheel diameters, two bikes can offer very different sensations. This is explained by the frame geometry. The height of the bike, the length of the front section, and the distance to the handlebars vary between brands. A model may therefore perfectly suit one child while another proves too long or too high.
The wheel diameter should therefore be considered a starting point. The final choice always depends on the child's actual comfort on the bike.
Children's bike size chart
To choose the bike size, an indicative chart linking the child's height to the wheel diameter is generally used.
|
Child's Height |
Wheel Size |
Approximate Age |
|
90–105 cm |
12" |
2–4 years |
|
95–110 cm |
14" |
3–5 years |
|
105–120 cm |
16" |
4–6 years |
|
115–135 cm |
20" |
6–9 years |
|
130–150 cm |
24" |
8–12 years |
This table allows for quick identification of the appropriate category, but it remains indicative. In practice, a child may be between two sizes, and the geometry varies from model to model.
That's why it's always best to try it out: let the child sit on the bike and ride a few meters. You can then immediately understand if the position is natural and if the bike is easy to control.
12, 14, 16 and 20 inches: what's the difference?
The differences between children's bikes are not limited to wheel diameter. As the size increases, the bike's structure also evolves. The frame lengthens, the wheelbase becomes larger, and the position becomes more stable. Moving to a larger size therefore means much more than just having larger wheels: it's a new step in learning and developing cycling skills.
The Orbea Grow 0 12” is an excellent choice for a first bike
Many manufacturers design their children's ranges based on this principle, progressively adapting the geometry and components to the child's age and skill level. Brands like Welt and Orbea thus offer complete series covering all stages of learning: from the first models for the youngest to bikes almost comparable to those for adults. This approach makes it easier to choose the right bike for the child's size and to gradually move to the next size as they grow.
12-inch bikes
12-inch wheeled models are for the youngest children. These are often the first bike after a balance bike or the first pedal bike. Their main purpose is to help the child learn the basics: pedaling, steering control, and using the brakes. At this stage, a low frame and light weight are particularly important. The child should be able to get on the bike easily and quickly put their feet on the ground.
12” and 14” bikes help children learn the basics
14-inch bikes
14-inch wheeled models often play a transitional role. They are suitable for children who have already mastered the basics but are not yet ready for the next size up.
These bikes offer a bit more stability while remaining easy to control for young cyclists who are starting to ride more regularly.
16-inch bikes
16-inch wheeled models are among the most common. At this stage, children generally ride with much more confidence and can cover longer distances.
The structure becomes more stable and the ride more predictable compared to previous models. Many children can already ride without training wheels at this stage.
The Orbea MX 16” bike
20-inch bikes
20-inch wheeled bikes represent the next step. Their structure is already closer to that of adult bikes. The frame is longer and the position more dynamic.
These models are often equipped with gears and are suitable for longer rides. For many children, it is from this size that real family bike rides begin in the city, parks, and on the bike paths of Île-de-France.
How to know if the bike fits
The best way to check the size remains simple: have the child get on the bike and carefully observe their position. If the size is correct, the child will feel comfortable from the first moments.
When stopped, the feet should be able to touch the ground easily. This is particularly important during learning, as it provides a sense of control and reduces the risk of falling.
The position should remain natural and relaxed. The child should not have to stretch their arms too much towards the handlebars. If this is the case, the frame is too long. If the knees come up very high while pedaling, the bike has already become too small.
On a well-fitted bike, the child adopts a relaxed and natural position
Seat height also plays an important role. It should be adjusted so that the leg is almost fully extended when the pedal is in the lowest position, while maintaining good control of the bike.
When to change bikes
Children grow quickly, which is why a children's bike is generally used for only a few seasons. On average, it is replaced every two or three years.
The first sign that the bike is becoming too small is the position of the saddle. If it is raised almost to its maximum height, the adjustment margin is already exhausted. In this case, pedaling becomes less efficient.
On average, a bike is replaced every two or three years
Another sign is excessive leg flexion during pedaling. When the knees come up too high, the movement becomes less natural, and rides become more tiring.
It also happens that parents notice that the child controls the bike less well or that the position seems unusual. In this case, it's worth checking if the bike size still matches the child's current height.
Mistakes when buying a children's bike
The most common mistake is to buy a larger bike so that it lasts longer. But a size that is too large makes the bike more difficult to control and can slow down learning.
Another common mistake concerns the weight of the bike. Heavier models are often cheaper, but they are also more difficult to handle. The child then gets tired faster and may lose the desire to ride.
To avoid any assembly problems, entrust it to professionals
It also happens that a new bike causes problems due to improper assembly or incorrect adjustments. Improperly adjusted brakes, a poorly adjusted saddle, or insufficient tire pressure can quickly spoil the experience. For this reason, it is preferable to entrust the assembly and adjustment of the bike to professionals before the first ride. The mechanics at the Routes and Roads workshop will carefully prepare the bike so that the child can ride safely.
Conclusion
Choosing the right bike size is the most important factor for a child's comfort and safety. When the bike fits their size, it is much easier for them to maintain balance, control the bike, and learn new skills.
A well-adapted bike makes learning easier and allows for full enjoyment of bike rides. This is particularly important for family rides in Paris, strolls in the parks, and trips on the bike paths of Île-de-France.
The experts at the Routes and Roads store in Paris can help you with this choice: selecting the most suitable children's bike, adjusting it according to the child's height, and verifying that the position is truly comfortable. All that will be left for you to do is enjoy bike rides and precious moments spent with family.
