The superlight, versatile children's bike with 20″ wheels, a safety-conscious design, BMX-style bars, and seven easy-to-operate gears for kids aged 6 and up. Fully equipped models include a set of BEAM Bike Lights, SNAP Click-On Fenders, the GLUG Stainless Steel Bottle and bottle cage, the VIENNA Bell, and our best-selling POP Kids' Bike Basket. Kickstand included.
Be aware that the bike and accessories may arrive in two separate deliveries.
The time has come for your child to learn how to shift gears! With easy twist-shifting and a child-friendly gear indicator, the GO 4 is the perfect bike to learn on. 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
woom LEGGIE Kickstand pre-installed
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
Schrader (car-type) valves allowing the tires to be pumped up at gas 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
Unsure how to measure inseam? Can't decide between two sizes? Check out our What Size is Right?article.
If you spot a difference between the product page and what you received, it’s likely due to a change in our supply chain. Our Customer Experience team is always here to answer any questions that you may have.
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 ready to roll for your child, including the tools you need.
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.
We have full confidence in our bikes, which is why we offer a 10-year warranty on the aluminum frames, rigid forks, bars and stem once you've registered online.
If you buy a product directly from us that does not meet your expectations for any reason, you can return it within 30 days of the purchase.
We will refund the full cost of the product and pay to have it shipped back to woom (US orders only). The refund for the cost of the product and return shipping cost will be processed within 5-10 business days of receiving the shipment.
Please note: We cannot refund the original shipping cost when you first purchased the product. Additionally, orders being returned from Canada will have to be shipped at the customer's expense.
To initiate a return and generate a return label, click here.
If you spot a difference between the product page and what you received, it’s likely due to a change in our supply chain. Our Customer Experience team is always here to answer any questions that you may have.
Our bike helmet comes in 3 sizes for kids aged 1 to 14. The innovative design guarantees the perfect fit, all-round protection, and ease of use. It's also ideal for roller skating and scooters.
Loud things come in small packages! Small but surprisingly powerful, this bicycle bell is the perfect way for kids to make themselves heard in traffic. See our video in the image gallery for assembly tips.
The versatile, lightweight bike basket made from BPA-free, flexible material easily pops onto the handlebars. Designed exclusively for woom GO bikes (1 PLUS, 2, 3, and 4).
Clean taste, glug after glug. Meet GLUG, our bicycle water bottle made of premium toxin-free stainless steel. Each GLUG also comes with our unique kid-friendly side-loading bottle cage which fits all standard diameter bike bottles.
Kids aren’t known for avoiding puddles, and now they don’t have to! Avoid mud-splattered shirts with the woom SNAP Click-On Fenders. These fenders are easy to install and are the perfect companion for wet roads and rainy commutes. Not only do they hug the radius of the tires, but also feature coverage of the tire sidewall for optimal splash protection. Compatible with all EXPLORE models, and GO and ORIGINAL models starting with woom 2.
Our breathable cycling gloves designed to be easy for kids to put on, ensuring maximum grip on the handlebars and providing optimum protection for delicate little hands. Sizes: 11,5 cm (5) | 13,5 cm (6) | 14 cm (7)
Our son got his start on WOOM 3 and now he's enthusiastically using the next generation!
We're happy because he learned it so quickly thanks to WOOM!
Automated AI translation
Great bike, like all WOOM bikes
It is already our third bike, I had a bit of concern about switching to the foursome - because of the gearshift, but like everything with Woom, the child sits on it and drives off. No problem with the circuit at all. Briefly explained and everything was wonderful. That's how it learned to ride a bike right away, even with the first bike. Unpacked, assembled briefly and the next day, the child was able to ride a bicycle.
Unfortunately, there were some problems with the pre-installed front brake this time. It had to be adjusted after the test drive was postponed by one day.
Big and disappointed children's eyes, but the next day after a huge bike ride, everything was fine again.
Automated AI translation
Top quality
For me, quality starts with packaging. There was nothing to complain about here. Everything was neatly and neatly packaged.
The individual parts were easy to assemble. All screws fit perfectly. The bike worked great when assembled.
This is quality that is unfortunately becoming increasingly rare these days.
Automated AI translation
Top Bike
My daughter has been riding Woom bikes right from the start. The Woom Bike 4go is light as a feather and the gearshift is a piece of cake for my daughter!
The bikes are simply great, without question!
Automated AI translation
The Woom 4 is already our third Woom and, as always, we love the bike itself. Unfortunately, this time I had to worry about a detail that didn't have to be the case. All previous wheels came with a high-quality bell (Woom Bing). The accompanying bell is apparently mandatory in Austria. With the current Woom 4, they have decided to save money and include an inferior bell. This is harder to use and sounds really awful. The child also complained immediately. Now I have to order an extra better bell, pay for shipping, wait and throw the enclosed bell in the trash, and that with a bike that costs almost 600 euros. I'm sorry, but it's hard to understand.
Reply fromwoom
Dear Christoph,
Thanks for your honest feedback!
We are very sorry that you did not like the included bell.
We have switched to a different bell here and we can understand that it does not meet your requirements.
Please write to our customer service about this, we are sure to find a good solution for your extra shipping costs here.:)
We are looking forward to your message!
Very best regards
your WOOM team
Automated AI translation
Top like all models
We already had the Woom 2 and Woom 3 with gears. All bikes have been reliable so far and have been used very gladly and extensively.
Automated AI translation
quality
The bike is for the birthday that is in June. I have already assembled the bike. Quality is more than satisfactory.
Automated AI translation
Super lightweight wheels
Starting with Woom 1, our granddaughter never wanted another bike again. (She also had a Puki balance bike at that time.) Then came the Woom 2, which is now being replaced by a Woom 4. Woom makes the best wheels, they are lightweight yet robust.
Automated AI translation
Best bikes
Fast delivery, best quality, kids enjoy to drive
The Best Birthday Gift Ever!
The Best Birthday Gift Ever!
We gave our 6-year-old the woom GO in Pink for her birthday, and it’s been a total game-changer. The vibrant "hot pink" color is stunning and high-visibility, but the real magic is the weight. It’s so lightweight that she can handle it, turn, and restart on hills with total confidence—no more "it's too heavy" frustrations!
Automated AI translation
Simply great
We love Woom bikes for our kids right from the start, the bikes grow with us.
Automated AI translation
Great bike
Very satisfied
Automated AI translation
The brand you trust
My kid loves it!
Good kids bike
Easy assembly, but the front brake grinds and I can't get it so that it fits (tried everything, even with YouTube instructions), I'll have it watched in a bike shop. The bike is OK, a good kids' bike. We also had the WOOM 2 and 3, these two (older) models were of higher quality in my opinion, the WOOM 4 looks cheaper in terms of components, which I find a bit annoying for the generous price.
Automated AI translation
Amazing, high-quality bike!
We are so impressed with the quality of the bike, worth spending a little more. The paint is bright and shiny, but doesn't scuff easily. Our 6 Year Who Was Riding Without Training Wheels Before Took to This Bike Immediatly. He had even more confidence and said it was so easy to ride. The helmet was also amazing, so easy to take on and off by himself and fit perfect. He was able to change the gears easily and the hand brakes fit his hands. I highly recommend WOOM as a company, their customer service is top notch!!
