Find the perfect BMX bike size for race, freestyle, street, or park riding. BMX sizing uses top tube length (in inches) — different from road or mountain bikes.
BMX bike sizing is fundamentally different from road or mountain bike sizing. While road bikes use frame size in centimeters and mountain bikes use S/M/L designations, BMX bikes are sized by top tube length measured in inches. The top tube length determines how stretched out or compact you feel on the bike, which directly affects trick control, racing stability, and overall comfort.
For kids under 12, wheel size is the primary sizing factor. BMX wheels come in 12", 16", 18", 20", and 24" (cruiser) diameters. Most adult BMX bikes use 20-inch wheels regardless of rider size — the frame dimensions change, not the wheel size.
| Rider Height | Wheel Size | Top Tube Length | Size Category |
|---|---|---|---|
| Under 3'6" (<107 cm) | 12" | 14" | Balance/Strider |
| 3'6"-3'11" (107-120 cm) | 16" | 16" | Mini |
| 3'11"-4'5" (120-135 cm) | 18-20" | 17.5-18.5" | Junior / Micro Mini |
| 4'5"-5'0" (135-152 cm) | 20" | 19-19.5" | Mini / Junior |
| 5'0"-5'4" (152-163 cm) | 20" | 20" | Expert |
| 5'4"-5'8" (163-173 cm) | 20" | 20.25-20.5" | Expert XL / Pro |
| 5'8"-6'0" (173-183 cm) | 20" | 20.5-20.75" | Pro / Pro XL |
| 6'0"-6'4" (183-193 cm) | 20" | 21-21.25" | Pro XXL |
| 6'4"+ (193+ cm) | 20-24" | 21.5"+ | Pro XXXL / Cruiser |
Speed-focused riding on purpose-built BMX tracks with berms, jumps, and gate starts.
Trick-oriented riding on ramps, halfpipes, and flatland surfaces.
Urban riding using stairs, rails, ledges, and handrails.
Skatepark riding in bowls, transitions, and quarter pipes.
Find the right bike size for children by age and height
Universal sizing tool for all bike types
MTB frame sizing for trail and off-road riding
Find your ideal handlebar width for comfort and control
Optimize your crank arm length for your riding style
Helps with wheel size recommendations for younger riders.
Enter your height and riding style to get a personalized BMX frame size recommendation