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Kids Bike Sizes

A Simple Buying Guide for the Perfect Fit

Kid Bike Buying Guide Image 1

Why read this.

We wrote this piece on kids bike sizes because we wanted to create a piece of content you could use as guide.

Something simple and easy to understand.

Although, you may be thinking:

Why should I pay attention to Ivanhoe Cycles? What makes you an authority?

Valid questions.

We sell thousands of kids bikes every year across all sizes. And we’ve been doing this for 40 years.

Kids that we’ve sold bikes to have grown into adults, and brought their kids into the shop to buy bikes.

Our team assesses the height, reach, coordination, growth within the size and riding posture. We then layer this with knowledge about the product itself to choose the right kids bike.

We do this for every-single-child. Many thousands of times every year.

Anyways, here’s the meat and potatoes and what you will learn about kids bike sizes:

  • Balance bike or pedal bike.
  • Kids bike sizes.
  • How we choose the right kids bike size.
  • Big W and Target are slightly cheaper. Why buy from a bike shop?
Kid Bike Buying Guide Image 2

Balance bike or pedal bike?

Balance bikes force young riders to find their balance point on the bike under them a lot faster. It’s a steeper learning curve because more coordination is involved.

But that’s a good thing.

Kids are sponges, and they pick up motor patterns fast.

These bikes have no training wheels. Rather, think of their feet (as they’re gliding along) as “training wheels”.

Most of the best young riders (at 3, 4 and 5 years old) we get through the shop have started on a balance bike.

Advantages:

  • Without pedals, children learn to balance their body weight on two wheels. This is the hardest part of learning to ride a bike.

  • IIt’s also true that balance bikes are MUCH lighter than pedal bikes. They don’t have the added weight of cranks, chain and sprockets (which are often made from heavier steel).

  • Plus they’re simpler and easier to maintain than a pedal bike.

  • Kids can start learning to ride at an earlier age than a pedal bike and less physical strength is required.

Disadvantage:

  • Kids can also outgrow their balance bike from a skill perspective. They may advance quickly, needing a pedal bike sooner.

Now, pedal bikes:

Kids who are comfortable pedalling (a lot of the time from a trike), are more comfortable with pedal bikes.

12-inch, 16-inch and 18-inch kids bikes with pedals will always come with training wheels.

Advantages:

  • Pedal bikes are equipped with hand & foot brakes. Teaching children how to use brakes is an essential skill for safe riding.

  • Riding a pedal bike involves learning more skills. This includes Shifting gears, using brakes, and maintaining a steady pedalling rhythm.  This is intellectually and physically stimulating.

Disadvantages:

  • They are heavier, so more strength is required from riders less than 4 years old.
  • Coordinating steering, pedalling and brakes can be too much for rides under 4 years old.
  • Coordinating steering, pedalling and brakes can be too much for rides under 4 years old.

Surprise. There’s a third option:

Balance bikes that transform into pedal-bikes later (Kidvelo are the only brand that do this).

This option has all the advantages (above) of a balance-bike. It also eliminates the disadvantage of parents having to spend more dollars on a pedal bike.

Kids Bike Sizes.

Here are the wheel-sizes available for kids bikes before they hit an XS adult frame:

The size you see advertised is the wheel size (the diameter of the tyre). Example: a 16-inch kids bike will have a 16-inch diameter tyre.

Super important!

There’s also the frame size. This is not listed or advertised.

And that’s why you’ve gotta be a little more careful. A 16-inch bike from Brand A isn’t going to be the same frame size as a bike from Brand B.

So that’s why we have a gazillion options. We’ve got bikes to suit tall, short and average size kids (within the same wheel size).

Time for an example:

In our 16-inch kids bike range, let’s compare these 2 popular kids bikes:

The Animator’s frame is shorter vertically (seat height).

That’s why we choose the Animator 16 for smaller riders. And for those who are just coming off training wheels.

The lower seat height allows kids to touch the ground with their feet for safety and stability.

The larger GT Grunge 16 is excellent for long-limb riders (think long legs and arms). The Grunge also allows for longer growth.

How to measure bike size for kids.

The luxury of having a large kids range means we can physically try young riders on different sized bikes.

Seat height is important. But reach (distance to the handlebars) is crucial.

Step 1.

Riders should have a slight bend in the knee.

If the seat needs to be raised at least 40mm (from the bottom), then you're probably better going the next frame or wheel size up.

* Note: rides with very short torso's are the exception. Because the longer frame might be too long to reach.

Step 2.

Now, we check the reach.

The torso should be bent slightly forward with (slightly) relaxed or bent arms.

Step 3.

If required, we slide the seat forward to reduce the distance to the handlebars.

This will make the bike "smaller".

Step 4.

Check the brake levers.

If riders can't pull the brake levers comfortably, then we adjust these closer to the handlebar.

Why buy from a bike shop?

We understand that kids bikes don't last forever. Kids grow fast after all.

But:

  • Bike shops support brands that design good-quality kids bikes. Because we don't want the headaches that arise from poor quality parts.

  • Kids bikes come assembled by experienced mechanics. So everything will work as it's intended.

  • Brands like Giant, Mongoose and ByK put so much thought and effort into making sure young riders have the best start to riding a bike.

    It's just so much easier for kids to ride a bike that's lightweight and well designed.

  • We offer amazing after sales support.

    If anything goes wrong, bring it in and we'll fix it. Simple.

Frequently Asked Questions

Kids Bike Sizes

Bike age for 16-inch?

4 years old.

For taller 4 year olds, we'd suggest the Mongoose Mitygoose 16 (boys) and Missygooose 16 (girls).

For parents who prefer a lower frame, consider the Giant Animator 16 or Liv Adore 16.

What size bike for a 3 year old?

14-inches.

We'd suggest the ByK E250 with learning handle.

What size bike for a 5 year old?

5 year old riders can go either way; 16-inch or 18-inch.

Small 5's should consider a 16-inch. Average to tall 5's would be best on an 18-inch kids bike.

ByK's E350 18-inch kids bikes are excellent options. They are very lightweight. Easy to ride. And ergonomic - inspiring lots of confidence.

What size bike for a 6 year old?

The vast majority of the time, it's going to be a 20-inch bike.

What size bike for a 8 year old?

Provide an answer to the question here, with as much detail as possible to help your customers.

What size bike for a 9 year old?

A 26-inch kids bike.

The 26-inch size fills the gap between a kids bike and adult bike.

We've found it to be a very successful size for most 9 and 10 year old riders.

View our 26-inch kids bike collection.

Assembly

Is assembly required?

No assembly is required.

If collected from one of our 3 locations, your kids bike will be 100% assembled by our team of experienced bike builders and mechanics.

On some occasions, kids bikes could be shipped it. In this case, we suggest taking it to you nearest bike shop for assembly.