01
Inseam
Stand them against a wall in their riding shoes. Slide a hardcover book between their legs, spine up, and raise it until it's snug. Measure from the floor to the top of the book.
The number that matters most
GoBike Size GuideRight size.
First ride.
Four bikes, from a toddler's first throttle to a teenager chasing 61 km/h. Measure one number, answer two questions, and we'll match your child to the right GoBike.
- Sizes
- 12–24″
- Ages
- 1–Adult
- Seat height
- 35–84 cm
- Returns
- 30 days
01 How to measure
How do I measure my child for a GoBike?
Inseam decides whether their feet reach the ground. Age narrows the range. Riding experience tells us whether to stay small or size up.
02
Age
Each GoBike covers an age range: 1–5 for the 12, 4–9 for the 16, 8–13 for the 20 and 12+ for the 24. The ranges overlap on purpose, because kids grow at different speeds.
Narrows it to one or two bikes
03
Riding experience
A first-timer is happiest on a bike they can flat-foot. A kid who already rips around the pump track can size up and grow into it.
Decides stay small or size up
02 Find their bike
Which GoBike size is right for my child?
Answer three quick questions. Inseam is optional, but it makes the match exact.
Our match
Stepping up
GoBike 16
Hydraulic brakes front and rear, an 80 mm fork and a 700W motor for dirt and pump tracks.
Seat 44–54 cm.
$1,399.00 ★ 4.9 (20)
Shop the GoBike 1603 The size chart
GoBike size chart by age and seat height
Your child fits a bike when their inseam reaches its lowest seat height. The higher settings are their room to grow.
| Bike | Age | Seat height | Max rider | Top speed | Best for | Shop |
|---|---|---|---|---|---|---|
| GoBike 12″First ride | 1–5 | 35–47 cm | 65 kg | 25 km/h | Backyards, grass, park paths | Shop → |
| GoBike 16″Stepping up | 4–9 | 44–54 cm | 65 kg | 45 km/h | Pump tracks, dirt trails, backyards | Shop → |
| GoBike 20″Big kid energy | 8–13 | 60–75 cm | 100 kg | 55 km/h | Bike parks, jumps, pump tracks, trails | Shop → |
| GoBike 24″Teens & adults | 12+ | 74–84 cm | 120 kg | 61 km/h | Rugged forest paths, steep dirt tracks | Shop → |
04 Between sizes
Between two sizes: stay small or size up?
Stay smaller if…
- It's their first motorised bike
- Their inseam is below the bigger bike's lowest seat (60 cm for the 20, 74 cm for the 24)
- They'll ride mostly in the backyard or the park
- They need to lift it themselves (10.5 kg for the 12 vs 12 kg for the 16)
Size up if…
- They already ride a balance bike or pedal bike confidently
- Their inseam already reaches the bigger bike's lowest seat
- They're heading to pump tracks, bike parks and trails
- They'll outgrow the smaller seat range within months
05 Growing up
How do I know they've outgrown their GoBike?
Seat at the top, knees still bent high
The seat is at its highest setting and their legs fold up when they ride.
Knees close to the handlebars
Look from the side while they ride. If their knees come up toward the bars, the frame is too small.
High mode isn't enough any more
They live in the top speed mode and want more. The next size up has a bigger motor and battery.
Heavier than the bike is built for
The 12 and 16 carry riders up to 65 kg, the 20 up to 100 kg and the 24 up to 120 kg.
06 Compare
Need every spec?
Motor, battery, ride time, brakes, suspension and weight for all four bikes, side by side.
07 Sizing FAQ
Questions parents ask us
Still unsure? Our team in NSW will help you choose.
Ask the GoBike teamWhat size electric balance bike does a 3-year-old need?
The GoBike 12. It's built for ages 1–5, its seat starts at 35 cm, removable training wheels come in the box, and Low mode is limited to 6 km/h while they learn.
Should a 5-year-old get the GoBike 12 or 16?
New riders do best on the 12. If they already ride a balance bike confidently and their inseam is 44 cm or more, the 16 fits now and gives them years of growing room up to a 54 cm seat.
How do I measure inseam for a balance bike?
With your child standing against a wall in their shoes, slide a hardcover book between their legs, spine up, until it's snug. The distance from the floor to the top of the book is the inseam.
What's the difference between the GoBike 16 and 20?
The 20 is a step up in every way: a 60–75 cm seat (vs 44–54 cm), a 1200W motor (vs 700W), a 10Ah battery (vs 5Ah), 55 km/h top speed (vs 45) and a 100 kg rider limit (vs 65 kg).
Can an adult ride the GoBike 24?
Yes. It's made for ages 12 and up through to adults, carries riders up to 120 kg and its seat adjusts from 74 to 84 cm. It's for experienced riders, not beginners.
What if the size isn't right when it arrives?
You can return an unused bike in its original packaging within 30 days. Our refund and returns policy has the steps.