Bike-skill milestones by age.

Cycling is one of the highest-value motor skills a child develops in the first decade. Done well, it gives them a 5 km perimeter by age 9, which roughly maps onto the independent-mobility radius their grandparents had at the same age.

The milestones below are average; individual variation is wide and that's fine.

The ladder

18-24 months. Sit on a balance bike and walk it forward. Total distance: a few metres.

2-3 years. Glide on a balance bike with both feet up. Steer around a cone. (The Dutch peuter-fiets data from the Onderzoek Veilig Verkeer Nederland surveys consistently finds that children who skip stabilisers and go from a balance bike to a pedal bike learn faster and fall less than children who started on stabilisers.)

3-4 years. First pedal bike. Most children on a balance-bike background skip stabilisers entirely; they balance on day one and then learn to pedal. Allow a week of grass-falling for the pedalling co-ordination.

5-6 years. Ride confidently on a quiet street, brake when asked, look over their shoulder. Can ride a quiet 1 km loop.

7-8 years. Ride safely on shared paths. Can ride a 3-5 km loop with one or two minor stops. This is roughly the walking-to-school distance on two wheels.

9-10 years. Ride independently in low-traffic neighbourhoods, including controlled junctions and shared roundabouts. Can do a 10 km loop with a friend. This is the age the Netherlands starts the school-administered bike test (verkeersexamen).

11-12 years. Cycle to school independently in moderate traffic. The Dutch national norm at this age is that ~80% cycle to school alone.

Three principles that beat any milestone chart

1. Balance bike first, always. This is the single biggest learning accelerator we know about.
2. Real road, not just the playground. Bike-handling improves an order of magnitude faster on actual surfaces with actual obstacles.
3. Friction-free access. A bike that lives next to the door is ridden. A bike in the basement isn't. Same logic as a yard you can walk into without asking.

When to worry

Almost never. If a 6-year-old still can't balance on a pedal bike, the cause is almost always too little practice, not a motor-skill issue. Twenty minutes a day for two weeks fixes most cases.

If genuine motor co-ordination concerns persist past 7 (across many activities, not just cycling), bring it up with the GP. That's a different conversation.