Official sizing guide for 2026
Woom uses a proprietary numbered sizing system (Woom 1 through Woom 6) based on precise height ranges rather than traditional frame sizes. Each model targets a narrow height band, and every component — from crank length to brake lever reach — is scaled specifically for each size. This child-centric approach ensures proper fit and proportional ergonomics at every stage of growth.
| Size | Height Range | Inseam Range |
|---|---|---|
| Woom 1 (12") | 2'8" - 3'3"(82 - 100 cm) | 11.8" - 15.7"(30 - 40 cm) |
| Woom 2 (14") | 3'1" - 3'7"(95 - 110 cm) | 14.6" - 18.1"(37 - 46 cm) |
| Woom 3 (16") | 3'5" - 3'11"(105 - 120 cm) | 16.9" - 20.5"(43 - 52 cm) |
| Woom 4 (20") | 3'9" - 4'3"(115 - 130 cm) | 19.7" - 23.2"(50 - 59 cm) |
| Woom 5 (24") | 4'1" - 4'9"(125 - 145 cm) | 21.7" - 26.0"(55 - 66 cm) |
| Woom 6 (26") | 4'7" - 5'5"(140 - 165 cm) | 24.8" - 29.9"(63 - 76 cm) |
Specific sizing recommendations for Woom's most popular bike models. Geometry measurements shown for reference size (typically M or 54cm).
Balance bike for ages 1.5–3.5 years. Ultralight at 6.6 lbs (3 kg). Low step-through frame with adjustable seat height. The best entry point into cycling for toddlers.
16-inch pedal bike for ages 4–6. Weighs only 12.3 lbs (5.6 kg). Features color-coded brake levers (green for rear, red for front) to teach proper braking technique.
20-inch bike for ages 6–8. At 16.5 lbs (7.5 kg), it's among the lightest in its class. Features an 8-speed SRAM grip shifter and V-brakes with kid-sized levers.
24-inch bike for ages 7–11. Weighs 18.7 lbs (8.5 kg). Bridges the gap between youth and adult cycling with 8-speed gearing and proportional geometry.
20-inch off-road bike for ages 6–8. Trail-specific geometry with wider tires, front suspension fork, and hydraulic disc brakes. Weighs about 18.5 lbs (8.4 kg).
24-inch electric kids mountain bike for ages 7–11. Features a lightweight FAZUA motor and integrated battery. Designed to help kids keep up on family rides and tackle longer climbs.
Use our free calculators to determine your ideal Woom frame size based on your measurements.
See why Woom is great for 3 year olds
4 Year Olds Sizing GuideSee why Woom is great for 4 year olds
5 Year Olds Sizing GuideSee why Woom is great for 5 year olds
6 Year Olds Sizing GuideSee why Woom is great for 6 year olds
7 Year Olds Sizing GuideSee why Woom is great for 7 year olds
8 Year Olds Sizing GuideSee why Woom is great for 8 year olds
9 Year Olds Sizing GuideSee why Woom is great for 9 year olds
Small Children (Ages 3–5) Sizing GuideSee why Woom is great for small children (ages 3–5)
Young Kids (Ages 5–8) Sizing GuideSee why Woom is great for young kids (ages 5–8)
Compare sizing across different bike manufacturers to find your perfect fit.