woom GO 4




























The superlight bike with 20″ wheels, a safety-conscious design, BMX-style bars and seven gears for kids aged 6 and up.
Ready for new adventures!
The time has come for your child to get to grips with the gears... yay! Shifting is so smooth on the woom GO 4 that bike life is about to get even better. From now on, you and your child will be able to set off on longer-than-ever expeditions with uphill or downhill stretches. A whole world full of new and exciting adventures awaits!
Frame
- Lightweight, high-quality AA 6061 aluminum with butted tubes
- 20″ wheels
- Agile and easy handling: low entry, very low riding position and forgiving front-end geometry resulting in good control and more grins
Gears
- 7 gears with a child-friendly gear indicator
- Twist shifter: microSHIFT Ds45
- Rear derailleur: microSHIFT M21SS
Fork
- Lightweight aluminum unicrown fork
- 1″ steerer tube
- Generous trail angle for easy, well-balanced handling
Wheels
- Ultralight aluminum rims
- Lightweight aluminum hubs with sealed bearings
- Front: fast installation and removal thanks to quick-release skewer
- Rear: installation and removal with 5 mm hex key
- 20 lightweight, super strong stainless steel spokes, double-crossed spoking
Headset
- Fully integrated 1″ headset
- Sealed industrial-grade bearings
- Integrated Ahead plug
Tires
- 20 × 1.4″ Schwalbe Little Joe
- High-quality, lightweight tires with low rolling resistance for maximum safety with minimum effort
- Car-type valves allowing the tires to be pumped up at petrol stations
- Reflective stripes for side visibility
Stem
- Superlight stem made out of forged aluminum
- 40 mm/+15°
- Recessed clamp bolts and sleek, rounded design making the stem extremely knee-friendly
- Handlebars attached to the stem with two 5 mm hexagon socket bolts
Saddle
- Ergonomic design
- Durable, waterproof and weather-resistant material
Handlebars
- Wide, ergonomic and lightweight aluminum bars for more control
- BMX style with high rise for maximum adjustability
- ABC marking for precise adjustment in relation to the saddle height
- Sandblasted and anodized in black
- Super narrow diameter grip, suitable even for very small hands
- Width: 560 mm
Seatpost
- Anodized aluminum seatpost with visible minimum insertion mark
- Integrated shim in the seat tube to stop scratching
- ABC marking for precise adjustment of the saddle height in relation to the handlebars
Grips
- Ergonomic design
- Ultra slim, child-specific diameter to ensure good grip
- Targeted comfort zone for ultimate hand-to-bar contact
- Oversized ends for protection in the event of a crash
- Lock-on grips with integrated anti-twist clamp
Seatpost clamp
- Made of aluminum
- Long quick-release lever, easy to operate requiring only minimal strength
- No risk of turning and/or twisting
Drivetrain
- Lightweight, forged 110 mm aluminum cranks with narrow tread (Q-factor)
- Narrow-wide chainring with 28 teeth
- Cassette with 11–28 teeth
- Narrow, flat platform plastic pedals
- Sealed cartridge
Brakes
- Two independently operated mini V-brakes requiring minimal strength for maximum braking power
- Ergonomic brake levers designed for small hands with short fingers and little strength
- High-quality Jagwire Bowden cables with low friction for smooth performance
Included tools
- 15 mm spanner for pedals
- 4 mm hex key for stem
Colors
woom red, vibrant yellow, hot pink, metallic turquoise, metallic blue
Weight
- 7.8 kg (without pedals)
Weight limit
- 70 kg
Shipping dimensions
- 107 × 57 × 24 cm
You can set up your bike within 5 minutes. Ready? Let's go!
This video is your guide to assembling the woom GO 4 and making sure it's tip-top for your child, including the tools you need.
Instructions for use
Find more information in our Service & Info area.

Innovative frame
The superlight aluminum frame is the heart of the bike. Its smart geometry with low entry and upright riding position allows your child to get on, ride and get off again safely. The long wheelbase and forgiving front-end geometry provide them with stability and guarantee a smooth ride.

Child-specific hand brakes
Your child won't struggle to bring their woom GO 4 to a stop even if their hands aren't very strong. That's down to the high-quality brake cables, the ergonomic brake levers and the small (but mighty) barrel adjuster that you can use to set the right distance between the brake lever and the handlebar grip for your child.

Protective handlebar grips
Our high-quality handlebar grips have a narrow diameter and an ergonomic design so your child can comfortably hold on with a good grip. The special material and extra large outer diameter keep your child safe, reducing the risk of them getting injured if they do happen to fall.

Ergonomic cranks
The length of the high-quality cranks and the distance between the pedals have been perfectly adapted to fit with children's bodies. This results in an optimum stance and natural movements that feel good. And there's no risk of your child getting their trouser leg caught thanks to the chainguard ring.

Intuitive twist shifter
Your child will get to grips with the gears in no time thanks to the easy-to-use twist shifter and the child-friendly gear indicator. They can shift to the next highest gear by twisting the shifter forward. And the little rider on the gear indicator will move toward the hare to show that your child is going faster. A twist back will shift the gear down again and the little rider will move toward the tortoise to show that your child is slowing down – perhaps because they're tackling a climb.

Handy quick-release skewer
The quick-release mechanism on the front wheel axle makes fast and easy work of dismounting and mounting the front wheel, so you can transport the woom GO 4 by car with no trouble at all.

Ergonomic saddle
The saddle has a major influence on the feel of the ride. And that's exactly why we carefully designed our saddle to suit the pelvis of children in the relevant age group and unlock ultimate comfort. Seriously – your child's ride couldn't be more comfortable!

Practical quick-release seatpost clamp
The quick-release seatpost clamp gives you – or even your child – a simple, quick and tool-free way to adjust the saddle height with perfect precision. On your pedals, get set, go!

All-round capable tires
Tires have a major influence on how a bike handles. That's why we've chosen tires that can be used on all kinds of terrain for the woom GO 4. Our lightweight tires will ensure maximum grip in any weather and on any surface so your child can confidently cover gravel, tarmac and dirt, riding in a straight line or taking corners along the way.

Bike fit guide on handlebars and seatpost
The ABC markings on the handlebars and seatpost make it easier for you to precisely adjust the woom GO 4 so the bike can grow with your child. Start by moving the saddle up or down so that your child can touch both feet to the floor and pedal comfortably. Match the handlebar marking to the seatpost and your child is good to go. How easy is that?!
Our woom bikes don't come with any additional accessories other than the front and rear reflectors. We automatically ship all woom bikes from size 2 and upwards within Italy only with bike lights and a bell to ensure compliance with the law. No further accessories are supplied with bikes in Italy. You can find useful extras, including kickstands and mudguards, in our online shop.
If your child plans on cycling on public roads and streets, their woom bike may need to meet certain standard requirements before it can be considered legal in your country of residence. In many countries, bikes must be equipped with a bike bell, front and rear lights, and wide-angle Z reflectors. As rules for cyclists and their equipment vary from country to country, find out about the regulations applicable to riding a woom bike in road traffic in your country or region, particularly regarding the use of lights, reflectors and other obligatory safety equipment.
The woom 10-year warranty*
Inspiring children to love riding their bikes is our mission at woom. That's why we guarantee the premium quality of every bike down to the last detail with innovative technology and long-lasting materials. In fact, we're so confident in our quality promise that we're offering to extend our warranty on frames, rigid forks, handlebars, stems and cranks from the usual two years to a full ten years – for free.
We have full confidence in our bikes, which is why we offer a 10-year warranty on the aluminium frames, rigid forks, bars and stem once you've registered online.
WARRANTY TERMS AND CONDITIONS
woom offers a 10-year manufacturer's guarantee on aluminium frames, rigid forks, handlebars and stem.
The initial activation of the 10-year warranty requires customers to register on the woom website within nine weeks from the date of purchase of a new woom bike upon submission of proof of purchase.
Provided that the bike has been registered properly, claims under the warranty must always be made via an authorised woom dealer (ideally the dealer that originally sold the bike) or through direct contact with woom if the bike was purchased from the woom online shop. To make a claim directly, send us an e-mail at [email protected] with the frame number, proof of purchase, proof of service (only required for used bikes) and photos or videos clearly showing the defect.
If a claim is made under the warranty, woom may choose to repair or replace any faulty parts at its own discretion. If a part cannot be replaced because the type, size or colour is no longer available, woom can provide a part regarded as a next-generation part to satisfy the claim made under the warranty. If a part or product is no longer being made at all or if no suitable spare part is available, woom reserves the right to exclude the warranty claim woom is under no obligation to provide original spare parts. No further claims can be made except for items expressly covered by this warranty. The warranty does not cover compensation for direct or indirect consequential damage. The buyer must cover any costs incurred for labour and/or postage and packaging costs.
The warranty is not extended or renewed when a claim is made under the warranty.
The warranty applies only to private end consumers. The warranty does not apply to end consumers using the products for their work, e.g. at a nursery or playgroup.
The guarantee applies internationally and can be transferred since it is tied to the product and not a person.
Legal warranty rights remain unaffected.
What is covered by the warranty?
Components/products | Warranty duration |
Material defects and production faults with the frame, rigid fork, handlebars, stem | Ten years from the date of purchase* |
E-mountain bike battery (woom UP) | Two years from the date of purchase |
KIDS' Helmet | Two years from the date of purchase |
What is not covered by the warranty?
- Damage caused by crashes or accidents
- Suspension forks or suspension elements
- Components susceptible to wear and tear like LEDs, dynamos, chains, tyres, rims, brake pads, grips, hubs, headset and bottom bracket bearings, and cranks
- Damage to the paintwork
- Damage caused by improper use, e.g. freestyling, stunts and any other overuse
- Damage due to lack of care
- Improper repairs performed by third parties who are not authorised woom dealers
- Bikes that have had their frame numbers changed, removed or made illegible
- Changes made to the original bike design and the addition of parts that are not approved for use with the bike
If you buy a woom product and are not 100% satisfied, or if you didn't order the right size, you have 30 days to send it back to us free of charge from within the EU for either a refund or an exchange.
This also applies to your new woom bike, even if your child has already ridden it.
We will cover the return shipping costs and either refund the full amount you originally paid or send you a new bike in the requested size.
Everything you need to know about our cancellation policy can be found here.
These products are compatible with the woom GO 4:

This lightweight yet robust rack for the woom ORIGINAL, woom GO, woom EXPLORE and woom NOW is easy to mount and comes with an integrated reflector.
Please check the compatibility of your woom bike. For more details on sizing and compatibility, please consult the product description below.