What Size Bike Does My Child Need?

Choosing the right size bike for your child is crucial for their comfort, safety, and enjoyment while cycling - but it’s not an easy job. With so many different bike sizes available, it can be confusing to know which bike size will be the perfect fit for your little one, especially if they look like they’re getting taller by the day! 

In this comprehensive guide, we'll walk you through the factors to consider and provide you with the necessary information to determine the ideal bike size for your child.

What size bike for their height?

Follow these steps to get a better understanding of which bike size might fit your child.

1. Measure Your Child's Inseam

Start by measuring your child's inseam, which is the distance from the ground to their crotch. This measurement will help you determine the minimum seat height required for a comfortable ride. Keep in mind that each bike model may have different minimum seat height requirements, so consult the manufacturer's guidelines for accurate measurements

2. Consider Wheel Size

Wheel size is a crucial factor in determining the overall bike size. Here's a general guide for matching wheel sizes to different age groups:

What Size Bike for a 2, 3 or 4 year old?

• 12-inch wheels: Suitable for toddlers aged 2 to 4 years old with inseam measurements around 14 to 17 inches. Opt for a balance bike which are specifically designed as a great starter bike. 

Check out our range of bikes for 2 to 4 years old. 

What Size bike for a 4, 5 or 6 year old?

• 16-inch wheel bikes: Designed for children aged 4 to 6 years old with inseam measurements between 18 and 22 inches. They provide a smooth transition from balance bikes to pedal bikes.

Check out our range of bikes for 4 to 6 year olds or bikes for 5 to 8 year olds. 

What Size bike for a 6, 7, 8 or 9 year old?

• 20-inch wheel bikes: Ideal for kids aged 6 to 9 years old with inseam measurements of 22 to 25 inches. These bikes are commonly used for neighbourhood rides and bike parks.

Check out our range of bikes for 5 to 8 year olds or bikes for 7 to 11 year olds. 

What Size bike for a 9, 10, 11 or 12 year old?

• 24-inch wheel bikes: Geared towards children aged 9 to 12 years old with inseam measurements between 24 and 28 inches. These bikes are great for longer rides and more challenging terrains.

Check out our range of bikes for 7 to 11 year olds or bikes for 11+ year old kids.

3. Consider Bike Frame Size and Standover Height

Alongside wheel size, the frame size and standover height are important considerations. The frame size should provide a comfortable riding position with a slight bend in the knees when the feet are on the ground. The standover height, which is the clearance between the top tube and the child's inseam, should allow for easy dismounts.

4. Test Ride and Adjustability

Whenever possible, encourage your child to test ride different bike models. This allows them to experience the bike's fit and comfort firsthand. Look for bikes with adjustable components, such as seat height and handlebar position, as they can accommodate growth spurts and provide a longer lifespan for the bike.

Picking the Perfect Fit

Choosing the right bike size for your child is essential for their safety and enjoyment while cycling. By measuring your child's inseam, considering wheel size, frame size, standover height, and test riding different models, you can confidently select a bike that fits them perfectly. 

Remember, as your child grows, it's important to regularly reassess their bike size to ensure a comfortable and safe riding experience. For fast-growing kids, it can be worth buying a bike that would be slightly too big for them. They’ll grow into it in no time meaning they can use it for longer and won’t need a replacement as quick.

Ready to find the perfect bike for your child? Remember to also decide what type of bike you would want your child to use, for instance bikes for toddlers could be balance bikes or push bikes. Not sure? Browse our range of balance bike for 2 year olds. Browse our full range of kids bikes or toddler balance bikes here on Bobbin bikes. You can also refer to our sizing guide for a more technical view on selecting what size bike for your child.

Happy cycling!