AUS
The perfect kids bike, direct to your door
One-stop kids' bike shop with sizing quiz, easy assembly, free 30-day returns, and best price guaranteed.
60-Day Bike Return
If it's not the perfect fit, return it within 60-days. Plus, we guarantee the best price - always.
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Professionally Built
Each bike is expertly tuned, 85% assembled, and ready to ride within minutes.
Watch Assembly Video
Safety First System
Kid-specific geometry, short-reach 2-finger brakes, and shorter cranks for confident, controlled riding.
Find the perfect kids bike
Take a quick quiz, and we'll recommend the right size and model.
Let's get started!
How would you like to measure your kid for their bike? Pick one option and click next to get started
What is your child's leg length?
What is your child's height?
with shoes on!
How old is your child?
Select age in years
Where will your child be riding most?
Smooth ground
Footpaths, bike paths, school ovals, and local parks
Adventure terrain
Bumpy parks, light trails, and uneven ground
Which best describes your child's riding skills?
Your recommended bikes
Based on your answers, here are the perfect bikes for your child:
Kids Bike Sizing Guide
Polygon Relic 20 - Kids Mountain Bike
Polygon Xtrada 20 - Kids Mountain Bike
Polygon Premier 20 Disc - Kids Mountain Bike
Polygon Premier 20 Disc EVO - Kids Mountain Bike
Polygon Relic 24 - Kids Mountain Bike
Polygon Siskiu D24 - Kids Mountain Bike
Polygon Siskiu D24 EVO - Kids Mountain Bike
Polygon Premier 24 XC Disc - Mountain Bike
Polygon Premier 24 XC Disc Evo - Kids Mountain Bike
Polygon Xtrada 24 - Kids Mountain Bike
Polygon Premier 24 Disc - Kids Mountain Bike
Marin Alcatraz 24 - Kids Dirt Jump Bike
What Kids Are Saying
Gina E. Verified Buyer
Awesome Bike!! Happy kid!!
Amazing experience and overall quality!
Lars
It's really good! I love this bike. My favourite is the way that it jumps.
Keith D. Verified Buyer
Fantastic Value
This was my first time ordering a bike online, and the first that I've ever even partially assembled myself. But the packaging and videos made it easy.
Jennifer Verified Buyer
Great kids bike at a great price
Was looking for a great lightweight entry level bike for my twin boys. This so far has fit the bill. Like that it came in 2 different color options.
Kym W. Verified Buyer
I love it
The bike was really easy to put together. And really smooth to ride once you are done i love it so much. I am Darcy wurst and the bike is my early christmas present
Jarrod C. Verified Buyer
First big girl bike
We bought this bike for my daughter's 8th birthday. She's always had box store bikes that were heavy and cumbersome. She struggled to ride for very long at a time. She immediately loved this one.
Frequently Asked Questions
Kids’ bikes are typically sized by wheel diameter, not frame size. Younger kids start with 12–16 inch wheels, while older or taller kids often ride 20–24 inch models. Use our Kids Bike Finder to match the correct size to your child’s height and age.
If your child loves dirt paths or light trails, a kids mountain bike is ideal. Our Kids Bikes Ages 10–16+ range includes lightweight options with wider tires and gears designed for off-road fun.
When your child has outgrown their starter bike, move up to a 20-inch (50 cm) or 24-inch (60 cm) model depending on height. Our Kids Bikes Ages 7–10 range offers lightweight options that make the transition smooth and comfortable.
If your child’s knees start to rise above the handlebars or they feel cramped while pedaling, it’s time for a 24-inch (60 cm) bike. Check out our Kids Bikes Ages 9+ selection for youth bikes designed to fit growing riders.
Yes, a lighter frame makes it easier for kids to balance, pedal, and stop safely. Many models in our Kids Bikes Collection use quality aluminum frames that improve handling and keep rides fun and fatigue-free.
Street bikes usually have smoother tires and simpler gearing, while trail or mountain bikes feature wider tires, suspension, and stronger brakes. Our Kids Bikes Ages 9+ collection includes both options for on-road and off-road fun.