Start here
Kids bikes: start here
If you have never bought a kids bike before, this is the short version. Four steps, in order, and a link straight to the picks for your child's stage.
The four steps
Step 01
Measure the inseam, not the age
Stand your child against a wall in the shoes they will ride in and measure floor to crotch. That one number decides which bikes can physically be ridden today. Here is how to measure a child's inseam in two minutes.
Step 02
Turn the inseam into a wheel size
Wheel size is shorthand, not a measurement, so check it against the inseam ranges the brands publish. The kids bike size chart maps 12, 14, 16, 20, 24 and 26-inch wheels to the inseam each one actually fits, and how to fit a kids bike covers the five checks once it arrives.
Step 03
Work out which stage you are buying for
Balance bike, first pedal bike, or first gears. Most buying mistakes are stage mistakes — the right bike bought two years early. If your child has not solved balance yet, read when to switch from a balance bike to a pedal bike.
Step 04
Go to the picks for that stage
Every section below opens with a top pick, a comparison table and a live price. Add a helmet sized by head circumference, and you are done.
Go straight to your section
- Stage 1 · roughly 18 months to 4 yearsBalance BikesBalance bikes explained by a parent: what inseam actually fits a 12-inch, when to start, which models last two years, and when a balance bike is the wrong buy.27 guides
- Stage 2 · roughly 3 to 6 yearsFirst Pedal BikesThe first pedal bike is mostly a weight problem. Here is what 12, 14 and 16-inch bikes really weigh, which inseam each one fits, and what to skip.31 guides
- Stage 3 · roughly 6 to 11 yearsBig Kid BikesWhere a kid's bike becomes transport: 20 and 24-inch bikes, when gears start to earn their keep, and what hand brakes change about how your kid rides.23 guides
- The spine · applies at every stageBike SizingAge does not decide bike size — inseam does. The full kids bike size chart, how to measure an inseam in two minutes, and what to do between sizes.23 guides
- Safety · every stage, no exceptionsHelmets & GearHelmet sizing by head circumference, how a kids helmet should actually sit, what CPSC certification covers, and whether MIPS is worth paying for.12 guides
- The how · the part gear can't solveLearning to RideHow to teach a child to ride in an afternoon, when to move off the balance bike, and the honest case against training wheels.10 guides
- Seasonal · birthdays and DecemberGift GuideBuying a bike as a gift means guessing at a measurement you cannot take. Here is how to guess well, what to buy alongside it, and what to do if the size is wrong.9 guides
The three questions parents ask first
What size bike does my child need?
Whatever the inseam says, not whatever the age on the box says. Brands disagree with each other by more than four inches of leg for the same quoted age, which is why the size chart is built from their published inseam ranges rather than from age bands. If your child falls between two sizes, take the smaller one.
Balance bike or training wheels?
A balance bike teaches the skill that actually makes a two-wheeler work. Balance bike vs training wheels lays out what each one teaches, and do kids need training wheels covers the case for skipping them.
How much should I spend?
Weight is what the money buys, and weight is what decides whether the bike gets ridden. How much to spend on a kids bike sets out what each price tier changes, and why kids bikes are so heavy explains the arithmetic behind it.
How the picks here are made
Every figure on this site — weight, minimum saddle height, inseam range, brake type — is the manufacturer's own published spec, linked to the page it was read from, across all 72 products in the registry. Scores run on a published 8.4 to 9.8 scale, and the full method is on how we choose. We earn affiliate commission on some outbound links, disclosed above the first link on every commercial page — see the affiliate disclosure.
If you would rather browse everything at once, the full page index lists every guide on the site grouped by section.