Your Brompton match
Based on your answers, your match is
Runner-up
View →Not seeing the right fit?Retake the quiz →
BENEFITS
Rewards
Earn 639 points with this purchase
No Sales Tax
Sales Tax Vacation! No Travel Required
Description
Superlight 20" Kids' Bike with 7-Speed Gearing for Ages 6 and Up
The Woom GO 4 is a versatile 20" children's bike designed for kids aged 6 to 8 who are ready to learn shifting and tackle longer adventures with uphill and downhill stretches. Built with a lightweight AA 6061 aluminum frame with butted tubes, this superlight design weighs just 17.2 lbs for agile and easy handling. The low entry point, very low riding position, and forgiving front-end geometry deliver good control and confidence-building performance on every ride.
Seven easy-to-operate gears with a child-friendly gear indicator and intuitive twist shifter make learning to shift simple and stress-free. Child-specific components throughout—including ergonomic brake levers, ultra-slim grips, and lightweight 110mm cranks with narrow tread—ensure young riders can control every aspect of the bike with minimal effort. BMX-style handlebars with high rise provide maximum adjustability as children grow, while ABC markings on both handlebars and seatpost guide precise setup for optimal fit.
Built for Growing Adventures
- Ultralight AA 6061 aluminum frame with butted tubes weighs just 17 lbs 3 oz for easy handling.
- 20" wheels with Schwalbe Little Joe tires feature low rolling resistance and reflective stripes for visibility.
- 7-speed gearing with child-friendly gear indicator makes learning to shift intuitive and fun.
- Easy-to-use microSHIFT twist shifter allows smooth gear changes with minimal hand strength.
- microSHIFT M21SS rear derailleur provides reliable shifting performance.
- Narrow-wide chainring with 28 teeth and 11-28 tooth cassette offer optimal gear range for varied terrain.
- Child-specific mini V-brakes require minimal strength for maximum braking power on both wheels.
- Ergonomic brake levers designed for small hands with short fingers and little strength.
- High-quality Jagwire Bowden cables with low friction ensure smooth brake performance.
- Lightweight forged 110mm aluminum cranks with narrow tread (Q-factor) improve pedaling efficiency.
- Narrow, flat platform plastic pedals with sealed cartridge bearings for durability.
- Low entry point, very low riding position, and forgiving front-end geometry create confident handling.
- Wide, ergonomic BMX-style aluminum handlebars with high rise provide maximum adjustability.
- ABC markings on handlebars guide precise adjustment in relation to saddle height.
- Ultra-slim grips with child-specific diameter ensure good grip for very small hands.
- Oversized grip ends provide protection in the event of a crash.
- Lock-on grips with integrated anti-twist clamp stay securely in place.
- Ergonomic saddle with durable, waterproof, weather-resistant material for all-weather riding.
- Anodized aluminum seatpost with visible minimum insertion mark and integrated shim prevents scratching.
- ABC markings on seatpost guide precise saddle height adjustment in relation to handlebars.
- Long quick-release seatpost lever is easy to operate with minimal strength.
- Ultralight aluminum rims with 20 super-strong stainless steel spokes using double-crossed spoking.
- Lightweight aluminum hubs with sealed bearings for smooth rolling.
- Front wheel quick-release skewer allows fast installation and removal.
- Rear wheel installs and removes with 5mm hex key for security.
- Fully integrated 1" headset with sealed industrial-grade bearings and integrated Ahead plug.
- Superlight forged aluminum stem with recessed clamp bolts and rounded design is extremely knee-friendly.
- Lightweight aluminum unicrown fork with generous trail angle for easy, well-balanced handling.
- Schrader (car-type) valves allow tires to be pumped up at gas stations.
- woom LEGGIE kickstand pre-installed for convenient parking.
- Compatible with woom POP Kids' Bike Basket for carrying gear.
- Weight limit: 155 lbs (70 kg) accommodates riders beyond the typical age range.
Size Information
Finding the Right Size
The most accurate way to size a Woom is by your child's inseam — not their age. Here's how to measure:
Have your child stand straight against a wall in their riding shoes. Place a hardcover book between their legs, spine up, with gentle pressure like a bike saddle. Mark the top of the spine on the wall, then measure from the floor to the mark. That's the inseam in inches.
Woom Road & Street
| Model | Inseam (in) | Height (in) |
|---|---|---|
| Woom 1 | 10.0 – 14.4 | 31 – 40 |
| Woom 1 PLUS | 14.8 – 18.5 | 37 – 43 |
| Woom 2 | 16.0 – 19.1 | 37 – 43 |
| Woom 3 | 19.1 – 25.2 | 41 – 47 |
| Woom 4 | 22.1 – 27.9 | 45 – 51 |
| Woom 5 | 26.4 – 32.3 | 49 – 57 |
| Woom 6 | 29.5 – 37.4 | 55 – 65 |
Woom OFF (Mountain)
| Model | Inseam (in) | Height (in) |
|---|---|---|
| OFF 4 | 22.8 – 28.7 | 46 – 51 |
| OFF 5 | 27.8 – 33.7 | 50 – 57 |
| OFF 6 | 30.3 – 37.8 | 55 – 65 |
Woom OFF AIR (Full Suspension)
| Model | Inseam (in) | Height (in) |
|---|---|---|
| OFF AIR 4 | 22.8 – 28.7 | 46 – 51 |
| OFF AIR 5 | 28.3 – 34.3 | 50 – 57 |
| OFF AIR 6 | 30.7 – 38.2 | 55 – 65 |
Woom UP (E-Mountain)
| Model | Inseam (in) | Height (in) |
|---|---|---|
| UP 5 | 28.0 – 33.5 | 50 – 57 |
| UP 6 | 30.9 – 37.4 | 55 – 65 |
Woom Now (Urban)
| Model | Inseam (in) | Height (in) |
|---|---|---|
| Now 4 | 22.1 – 27.9 | 45 – 52 |
| Now 5 | 26.4 – 32.3 | 49 – 58 |
| Now 6 | 29.5 – 37.4 | 56 – 66 |
UPC / Part Numbers
| Option | SKU | UPC |
|---|---|---|
| Hot Pink | 100885-0000-4005 | 9120083729207 |
| Metallic Blue | 100885-0000-3010 | 9120083729191 |
| Metallic Turquoise | 100885-0000-2008 | 9120083729184 |
| Vibrant Yellow | 100885-0000-5007 | 9120083729214 |
| Woom Red | 100885-0000-1002 | 9120083729177 |
