Choosing the right size bike for your child is one of the most important steps in making cycling safe, comfortable, and fun. But with so many options available, how do you know which size to pick?

This guide explains how kids’ bike sizing works and what to look out for. Of course, nothing beats visiting a Ridgeback stockist, where experienced staff can help you find the perfect fit and let your child try before you buy.

Unlike adult bikes, which are sized by frame, children’s bikes are sized by wheel diameter.

As bikes increase in size, the wheel size grows to match, ensuring better balance, control, and overall riding experience.

Ridgeback kids’ bikes range from 12-inch wheels for the youngest riders up to 27.5-inch wheels. At this stage, many children are ready to transition to smaller adult bikes.

The best bike size depends primarily on your child’s height and confidence level—not just their age.

As a general guide:

• Balance bikes (12") – suitable from around 2 years old
• 14"–16" bikes – ideal for first pedal bikes
• 20"–24" bikes – for developing riders
• 26"–27.5" bikes – for older children and pre-teens

Every child develops differently, so it’s always worth checking the fit in person where possible. 

It might seem sensible to buy a slightly bigger bike so your child can grow into it—but this can backfire.

A bike that’s too large can feel uncomfortable and difficult to control, which may discourage your child from riding altogether. By the time it finally fits, they may have lost interest.

For the best experience, choose a bike that fits now and size up when needed.

Children typically need a new bike every two to three years, depending on how quickly they grow.

 
What Happens to Old Bikes?

The good news is you don’t need to hang onto them forever. Ridgeback bikes are built to last, making them ideal for passing down to siblings or selling second-hand.