BMX bike size chart by height
Skatepark, pump track or the start gate. A BMX that fits is easier to throw around.
Short answer: BMX bikes are sized by top tube length (in inches), and for younger riders also by wheel size. In one BMX shop's freestyle chart, riders from about 4'8" up ride 20-inch wheels, and the top tube grows from about 18.5" to 21.25" as riders get taller.[1 · Nov 9, 2026] The shop calls these generalized recommendations: fit varies by brand and personal preference.[1 · Nov 9, 2026]
Freestyle BMX size chart
| Rider height[1 · Nov 9, 2026] | Wheel size | Top tube length |
|---|---|---|
| 2'4"–3'0" | 12″ | 12–13″ |
| 2'8"–3'6" | 14″ | 14–14.5″ |
| 3'2"–4'0" | 16″ | 16–16.5″ |
| 3'10"–4'8" | 18″ | 18–18.5″ |
| 4'8"–5'2" | 20″ | 18.5–20″ |
| 5'0"–5'4" | 20″ | 20″ |
| 5'2"–5'6" | 20″ | 20.25″ |
| 5'4"–5'8" | 20″ | 20.5″ |
| 5'6"–6'0" | 20″ | 20.75″ |
| 5'8"–6'2" | 20″ | 21″ |
| 6'0" and up | 20″ | 21.25″ |
Ranges overlap in the shop's chart; if your height is in two rows, either may work, and personal preference decides.[1 · Nov 9, 2026]
BMX race size chart
Race frames use named sizes instead of a wheel size:
| Frame size[1 · Nov 9, 2026] | Rider height | Top tube length |
|---|---|---|
| Micro | 4'4" and under | 15–16.5″ |
| Mini | 4'2"–4'10" | 16–17.5″ |
| Junior | 4'6"–5'1" | 17–18.5″ |
| Expert | 5'0"–5'4" | 18.5–19.5″ |
| Expert XL | 5'2"–5'6" | 19.5–20″ |
| Pro | 5'3"–5'8" | 20–20.5″ |
| Pro XL | 5'7"–6'0" | 20.5–21.25″ |
| Pro XXL | 6'0" and up | 21.25–22″ |
The same chart also suggests stem length, bar rise and width, crank length and gearing for each race size.[1 · Nov 9, 2026]
Kids on BMX bikes
The freestyle chart starts at 12-inch wheels for the smallest riders, the same wheel sizes used for kids' bikes. For a first pedal bike, compare with the kids bike size chart, and don't buy big to "grow into".
Want a quick answer? Pick BMX in the bike size finder and enter a height.
Sources: 1. Dan's Comp, BMX rider sizing chart (freestyle and race charts checked Nov 9, 2026; freestyle chart first checked Nov 4, 2026). Trademarks belong to their owners; charts are restated in our own tables, not reproduced.