12” vs 14” kids’ bikes: What’s the difference?

Choosing your child’s first bike is a huge milestone, but with so many sizes and styles available, it can be tricky to know where to begin. Should your child start on a balance bike or jump straight to pedals? And is a 12-inch or 14-inch kids’ bike the right fit for their height, confidence, and cycling experience?

At Frog Bikes, we design lightweight, child‑specific bikes that help young riders build confidence, coordination, and a lifelong love of cycling. This guide explains the key differences between 12” vs 14” kids’ bikes, and the best bike size for toddlers, including toddler balance bike sizes and first pedal options, so you can choose the perfect bike for your little rider.

The difference between a 12-inch and 14-inch bike is more than just wheel size. Each model supports a different stage of your child’s cycling development.

At Frog Bikes, we offer:

• A 12” balance bike (Frog Tadpole) - Ideal for younger children learning to balance for the first time.
• A 14” balance bike (Frog Tadpole Plus) - Perfect for taller beginners or children who need more time to master balancing.
• A 14” first pedal bike (Frog 38) -Designed for children who are ready to learn how to pedal independently.

Below, you’ll find a detailed comparison to help you choose the right size.

Best for: Children aged 2–3 years with an inside leg measurement of 31–41cm

Bike type: Balance bike (no pedals)

The Tadpole is our classic 12-inch balance bike. The ideal starting point for toddlers discovering the joy of two wheels. It helps children develop balance, steering control, and confidence before transitioning to a pedal bike. 

• Lightweight aluminium frame for easy handling
• Hand brake to introduce safe stopping
• Adjustable seat and handlebars for growing riders
• Comfortable grips and fun colour options
• Helps children skip stabilisers entirely

Balance bikes like the Tadpole help kids skip stabilisers altogether, giving them a more natural and confident path to pedalling, making it the ideal first bike for toddlers. Check out our Are balance bikes better than stabilisers blog for more information.

The latest Tadpole model has also been updated with refined geometry, bringing it in line with our Tadpole Mini. It now features a sweeping frame design that offers improved stand‑over height, easier mounting and dismounting, and a more confidence‑inspiring riding position for young beginners.

Colour options: Electric blue, Red, Green and Pink

"We bought the Frog Tadpole balance bike for my boy and couldn't be happier with it. It's transformed his riding and confidence. He's happy riding on the pavement, in the park and at the BMX track. The back brake, steering over lock, weight and size are its best features." - Mr B

Shop the 12-inch Tadpole balance bike >>

Best for: Children aged 3–4 years with an inside leg measurement of 36–47cm

Bike type: Larger balance bike (no pedals)

The Tadpole Plus is perfect for slightly older or taller children who aren’t ready for pedals yet. Whether they’re brand new to cycling or simply need more time to build confidence, this 14-inch balance bike gives them the space and stability they need.

Don’t rush pedals! Balance bikes often result in quicker, more confident pedalling without stabilisers.

• Larger 14” wheels for smoother, more stable riding
• Lightweight frame for improved control
• Hand brake for safe stopping
• Comfortable, upright riding position
• Ideal stepping stone before a first pedal bike

If your child has outgrown the Tadpole or still needs to work on their balance, the Tadpole Plus offers the right size and support.

The Tadpole Plus has also recently received the same geometry upgrade as the Tadpole Mini, now featuring a sleek, sweeping frame that enhances comfort, stability, and ease of use. This updated design gives taller beginners even more room to grow while maintaining excellent control and balance.

Colour options: Electric blue, Red, and Green

"We have two Frog bikes – the Tadpole Plus balance bike and a first pedal bike – and the quality is outstanding. The Tadpole Plus in particular has been brilliant for my daughter: it's lightweight, well-built, and comes with a proper brake, which gave her the confidence and control she needed to transition to her first pedal bike." – Dan

Shop the 14-inch Tadpole Plus balance bike >>

Best for: Children aged 3–4 years with an inside leg measurement of 36–41cm

Bike type: First pedal bike

If you’re wondering when to move from a balance bike to a pedal bike, it is once your child has mastered balance, and the Frog 38 is the perfect next step. This lightweight 14-inch pedal bike is designed to make independent cycling smooth, safe, and enjoyable.

• Lightweight, child‑specific frame for easier starts and stops
• Patented Frog cranks for efficient pedalling
• Short‑reach brake levers for small hands
• Comes with bell, reflectors, and essential safety features
• Can be used as a balance bike by removing the pedals
• Updated geometry for improved comfort and control

The Frog 38 replaces the retired Frog 40 and has been updated with refined geometry and improved fit for early riders. The Frog 38 can also be used as a balance bike temporarily, simply by removing the pedals. 

Colour options: Electric blue, Red, Green, Pink and Spotty

"I first purchased my son a Frog bike when he was 4 years old and needed his first pedal bike. It exceeded all expectations, being so lightweight, it made learning to ride a pedal bike so much easier!" - Mrs W

Shop the 14-inch Frog 38 first pedal bike >>

Here's a helpful way to think about it:

• If your child is just learning to balance and steer and has an inside leg measurement of between 31-41cm, go for the Tadpole (12" balance bike)
• If they’re a bit taller, with an inside leg measurement of 36-47cm, but still need to work on balance, choose the Tadpole Plus (14" balance bike)
• If they’re confidently gliding and ready to pedal independently and have an inside leg measurement of 36-41cm, the Frog 38 (14" first pedal bike) is the ideal next step

Top tip: Always choose a bike based on inside leg measurement, not age. You can try our kids’ bike size guide or visit a Frog Bikes stockist to get fitted in person.

1. Stand your child, in their socks (no shoes), against a wall
2. Place a small book between their legs (with the spine upwards), as high as is comfortable
3. Ask the child to move away and measure from the spine of the book to the floor

Explore our full range of lightweight kids’ bikes, including balance bikes and first pedal bikes, or visit your local Frog Bikes retailer for expert fitting and a test ride.

And, remember - don't go cycling without a bike helmet! - Safety first!

What age is a 12-inch bike suitable for?

A 12-inch bike is typically suitable for children aged 2–3 years, but the most accurate way to choose is by measuring your child’s inside leg. The Frog Tadpole 12” balance bike fits riders with an inside leg of 31–41cm.

Should my child start on a balance bike or a pedal bike?

Most children benefit from starting on a balance bike, as it teaches coordination and control without the distraction of pedals. Once they can glide confidently, they’re usually ready for a first pedal bike like the Frog 38.

Can a 14-inch pedal bike be used as a balance bike?

Yes. The Frog 38 can be temporarily used as a balance bike by removing the pedals, making it a flexible option for children transitioning from gliding to pedalling.

How do I know if my child is ready for a pedal bike?

Your child is ready for a pedal bike when they can:

• Glide confidently on a balance bike
• Steer with control
• Stop safely using a hand brake

If they meet these milestones, the Frog 38 is a great next step.

Is it better to choose a bike they can grow into?

No. A bike that’s too big can feel heavy, unstable, and difficult to control. Choosing the correct size helps your child ride safely and confidently, and often means they learn faster.

Do kids need stabilisers with Frog bikes?

Not at all. Frog balance bikes are designed to help children develop their skills naturally, without the need for stabilisers. Most little riders who begin on a balance bike move to pedals confidently without ever using them. If a child feels a bit wobbly on their first pedal bike, a balance buddy can offer gentle support while they build confidence and stability as they learn to ride.