Best 20 inch kids bikes

At 20 inches the question changes from "can they ride it" to "where are they riding it". Flat neighborhood loops do not need gears. Hills, school runs and family rides do.

Fit still comes first

Note the inseam column. Guardian's 20 Small takes an 18.3 inch minimum leg length; woom's GO 4 wants 22.1 inches. That is nearly four inches of child between two bikes with the same wheel size.

Weight at seven

Both are far better ratios than a five-year-old on a mass-market 16-inch, because children gain weight faster than bikes do. This is the age where weight stops being the dominant issue and gearing starts.

Gears or no gears

A single-speed 20-inch is simpler, cheaper, lighter to maintain and perfectly adequate on flat ground. A geared bike lets a child keep pedaling up a hill instead of pushing. The honest test is your neighborhood, not your child's age — the full argument is on when do kids need gears.

Brakes at this size

The Alpha Three runs Promax hydraulic discs — genuinely better in the wet and requiring one finger rather than a fist. The GO 4 uses dual V-brakes, lighter and easier to service. The Guardian keeps its single-lever SureStop, which is the most beginner-proof and the least adjustable. If the riding involves hills or rain and the brakes are what you are shopping on, the disc-braked options at this size and above are ranked on best kids bikes with disc brakes.

Which one

Hills and wet weather: Prevelo Alpha Three. Discs and a 21.2 inch minimum saddle mean a smaller child can ride real terrain.

First geared bike: woom GO 4. The numbered gear indicator makes shifting teachable rather than mysterious.

Small rider, flat ground: Guardian 20 Small. The lowest published leg length here, single speed, hard to get wrong.

If the inseam is already past this size: do not buy a 20-inch to be safe. woom's 24-inch asks for 26.4 inches of inseam and Guardian's for a 22 inch leg length — the next size up is compared on best 24 inch kids bikes.

If the riding is trails rather than pavement: none of these three is the bike. The 20-inch trail options, including an 18.9 lb rigid bike and the honest case against cheap suspension forks, are on best kids mountain bikes.

The age band these bikes genuinely cover, and the nearly four inches of disagreement between their published fit floors, is on what age is a 20 inch bike.

And if the choice is really between this size and the next one up, 20-inch vs 24-inch is the comparison — it is the widest jump in kids bikes, and sizing up early is the most common way a good bike stops getting ridden.

The budget pick here gets its own write-up: the Retrospec Koda 20 review covers the 20-inch that ships with no coaster brake at all and publishes six inches of saddle travel.