Best kids bike for a 5 year old: size by height
Measure first, shop second. The best bike for a five-year-old is the one that fits their height today.
Short answer: in Trek's kids' chart, ages 4–6 usually ride 16-inch wheels (3'5"–4'0" tall) and ages 5–8 ride 20-inch wheels (3'9"–4'6" tall).[1 · Oct 29, 2026] Age is only a rough guide: go by your child's height and inseam, then check the exact bike's chart.[1 2 · Oct 29, 2026]
Kids' bikes compared by the maker's rider height
| Bike | Wheel | Rider height on the maker's chart |
|---|---|---|
| woom GO 2 (14″) | 14″ | 3'1"–3'7" (94–109 cm)[3 · Oct 30, 2026] |
| Trek Precaliber 16″ | 16″ | 99–117 cm (3'3"–3'10")[4 · Oct 30, 2026] |
| Guardian 16 Inch Bike | 16″ | 3'4"–3'10" (102–117 cm)[5 · Oct 30, 2026] |
| woom GO 3 (16″) | 16″ | 3'5"–3'11" (104–119 cm)[6 · Oct 30, 2026] |
| Priority Start 16″ | 16″ | 3'5"–3'11" (104–119 cm)[7 · Oct 30, 2026] |
| Cannondale Kids Trail 16 | 16″ | 112–122 cm (3'8"–4'0")[8 · Oct 30, 2026] |
| Trek Precaliber 20″ 7-Speed | 20″ | 114–132 cm (3'9"–4'4")[9 · Oct 30, 2026] |
| Trek Wahoo 20 Trail | 20″ | 114–132 cm (3'9"–4'4")[10 · Oct 30, 2026] |
| woom GO 4 (20″) | 20″ | 3'9"–4'3" (114–130 cm)[11 · Oct 30, 2026] |
9 bikes from our size data with 14-, 16- or 20-inch wheels, sorted by wheel size, with each maker's own height range (converted, rounded). We have not ridden or tested these bikes and don't rank them; the table shows which heights each maker says the bike fits. No prices: they change too often to show here.
16 or 20 inch for a 5 year old?
- General minimums: one cycling guide suggests at least 3'5" tall (inseam 16″) for 16-inch wheels and 3'11" (inseam 20″) for 20-inch wheels.[2 · Oct 29, 2026]
- Don't size up to "grow into": a bike that is too big can slow learning and hurt confidence, and can compromise safety and stability.[1 2 · Oct 29, 2026]
- Fit check: on a first bike without training wheels, feet flat on the ground while seated; standing over the bike, an inch or two between your child and the top tube.[1 · Oct 29, 2026]
- More sizes, from 12 to 26 inches: kids bike size chart. For helmets: helmet size by head size.
Sources: 1. Trek, Kids bike buyer's guide by age and size (re-checked Oct 29, 2026). 2. BikeRadar, Bike sizes for kids (re-checked Oct 29, 2026). Maker charts: 3. woom GO 2 (14″) size chart (checked Oct 30, 2026). 4. Trek Precaliber 16″ size chart (checked Oct 30, 2026). 5. Guardian 16 Inch Bike size chart (checked Oct 30, 2026). 6. woom GO 3 (16″) size chart (checked Oct 30, 2026). 7. Priority Start 16″ size chart (checked Oct 30, 2026). 8. Cannondale Kids Trail 16 size chart (checked Oct 30, 2026). 9. Trek Precaliber 20″ 7-Speed size chart (checked Oct 30, 2026). 10. Trek Wahoo 20 Trail size chart (checked Oct 30, 2026). 11. woom GO 4 (20″) size chart (checked Oct 30, 2026). Trademarks belong to their owners; charts are restated in our own tables, not reproduced.