Children's Bike Size — Which Size for Which Age?

Why is the right bike size so important?

A bike that's too big or too small is not only uncomfortable — it's also unsafe. Children who can't safely touch the ground with their feet can't react properly in dangerous situations.

Size Chart: Children's Bikes by Height

• 12 inch: Height 95–105 cm (approx. 2–4 years)
• 16 inch: Height 105–120 cm (approx. 4–6 years)
• 20 inch: Height 120–135 cm (approx. 6–9 years)
• 24 inch: Height 135–145 cm (approx. 8–12 years)
• 26 inch: Height from 140 cm (approx. 10–14 years)

What to look for when buying a children's bike?

• Coaster brake: Recommended up to age 6 — small hands often lack strength for hand brakes.
• Weight: A lighter bike is easier to control. Rule of thumb: max. 30–40% of the child's body weight.
• Training wheels: Not recommended by experts — better to start with a balance bike.
• Lighting: Required by law for road use.
• Mudguards & chain guard: Protect clothing and improve safety.

Frequently Asked Questions About Children's Bike Sizes

How much growing room should a children's bike have? One size up is acceptable — the child should just be able to touch the ground. Going two sizes up is dangerous.

Should I buy new or used? Used children's bikes are a smart choice since children grow quickly. At Karaarslan Bike, every used bike is safety-checked and comes with a 3-month warranty.

Balance bike or bike with training wheels? Balance bikes (no pedals, no training wheels) teach natural balance. Children who start on a balance bike typically learn to ride a pedal bike within days.

Children's Bikes at Karaarslan Bike

We stock new and used children's bikes from 12 to 26 inch. Every used bike is safety-checked and comes with a 3-month warranty. Your child can test ride before you buy — we'll find the perfect size together.