woom GO 4 - (Gen. H)

woom GO 4 - (Gen. H)

The superlight bike with 20″ wheels, a safety-conscious design, BMX-style bars and seven gears for kids aged 6 and up.

In stock – delivered to you within 4 to 7 working days!
Colour: woom red
Free returns incl. VAT plus shipping €549.00
  • Free Returns
  • Money Back Guarantee
  • Free Shipping €99+
  • Two-year Warranty
  • Award-winning Design
Size: 20″
Weight: 7.8 kg (17.2 lb)
Top features: Child-specific shifting, ergonomic saddle, protective handlebar grips, BMX-style bars, handy quick-release skewer

Age: 6 – 8 years
Height: 115 - 130 cm (45 - 51 in)

Ready for new adventures!

Specifications

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

Geometry

Features & highlights

All components that have been specifically designed with safety in mind bear the KIDSAFE PLUS seal.
Profile view of the woom GO 4 bike for children aged 6 years and up

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.

Detailed view of a brake lever on the woom GO 4 children's bike with 20″ wheels

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.

Detailed view of the stem, handlebars and grips on the woom GO 4 children's bike

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.

Detailed view of the cranks and pedals on the woom GO 4 children's bike

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.

Detailed view of the twist shifter on the woom GO 4 children's bike

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.

Detailed view of the quick-release skewer for the front wheel on the woom GO 4 children's bike with 20″ wheels

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.

Detailed view of the saddle on the woom GO 4 children's bike

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!

Silver seatpost clamp with silver quick-release lever on the woom GO 4 children's bike

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!

Detailed view of the front 20″ wheel on the woom GO 4 children's bike

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.

ABC markings for adjusting the handlebars/saddle on the woom GO 4 children's bike

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?!

What's in the box?

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.

Guarantee information

Our standard 2-year warranty applies to the frame and components automatically from the day you purchase your woom bike. Members of our woom Riders Club can extend the warranty on aluminum frames, rigid forks, handlebars, stems and cranks to 10 years for free by registering their bike within 9 weeks of buying it.

Click here to join the woom Riders Club.

Click here to find out more about our extended warranty and to read the full terms and conditions.

Legal right to cancel goods & services

If you buy a woom product and are not 100% satisfied, or if you didn't order the right size, you have 30 days (WOW 60 days) to send it back to us free of charge from within the EU for a refund.

This also applies to your new woom bike, even if your child has already ridden it.
We will cover the return shipping costs and refund the full amount you originally paid.

Everything you need to know about our cancellation policy can be found here.

These products are compatible with the woom GO 4:

READY Kids' Helmet + READY Helmet Light
READY Kids' Helmet + READY Helmet Light

READY to ride! We've bundled up our READY Kids' Helmet and rechargeable READY Helmet Light to make sure kids aged 1 to 14 stay safe and visible on their outdoor adventures. Choose a color, select a size and you're good to go! The helmet light is compatible with the READY Kids' Helmet in every size.

46–50 cm (XS) | 50–53 cm (S) | 53–57 cm (M)

€89.80
READY Kids' Helmet
READY Kids' Helmet

Our bike helmet comes in 3 sizes for kids aged 1 to 14. The clever design guarantees the perfect fit, all-round protection and ease of use. It's also ideal for skateboards and scooters.

46–50 cm (XS) | 50–53 cm (S) | 53–57 cm (M)

€74.90
POP Bike Basket and POP ONS Bike Basket Charms
POP Bike Basket and POP ONS Bike Basket Charms

Bundle containing the POP Bike Basket and the POP ONS Bike Basket Charms. The lightweight basket made from flexible, BPA-free material can easily be popped onto the handlebars of the woom ORIGINAL 2, 3 and 3 AUTOMAGIC. Your child can customize their bike basket with the four lovely little charms.

€39.90list price €44.80
LEGGIE Kickstand
LEGGIE Kickstand

Our innovative LEGGIE kickstand is compatible with all woom ORIGINAL/GO/EXPLORE/OFF/OFF AIR/UP bikes (except the woom ORIGINAL/GO 1). It is NOT included when you buy one of our bikes.

€19.90
SNAP Click-On Mudguards
Models 2020 onwards
SNAP Click-On Mudguards

Our mudguards designed for the woom EXPLORE and woom GO/ORIGINAL bikes with 14" to 26" wheels provide maximum water protection from road spray and puddles, and are easy to mount and remove.

€34.90
VIENNA BELL
VIENNA BELL

Our premium brass bike bell is easy to use and ensures a strong and clear sound.

€11.90
PICKUP Rack
Models 2020 onwards
PICKUP Rack

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. 

€39.90
BEAM Bike Lights
NEW
BEAM Bike Lights

These powerful, rechargeable LED bike lights with a weatherproof design are easy to attach and use. They run for up to 6 hours and turn off automatically when not in use. For children aged 3 and up.

€39.90
LUMI Reflective sticker set
LUMI Reflective sticker set

With these high-quality reflective frame stickers your child can customize their woom GO. The set includes two sticker sheets.

€12.90

Ratings & Reviews

4.70Based on 75 reviews
We love our WOOM bike

My son received a woom 4 as a gift for his 5th birthday. That was after he had learned to ride a bike without training wheels, his first more expensive bike. woom was recommended to us by friends because it is very light, has a great gear shift for learning how to shift gears and is also easy to resell in the end. These were the arguments that convinced us to buy. Unfortunately, my son grew so fast that we bought a woom 5 after just 10 months. We were sold the woom 4 very quickly at a good price and bought the woom 5 from a retailer in Hildesheim. All in all, we are very satisfied with everything and my son loves his blue woom 5.

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Great bike - super weight and quality

Our child loves the Woom 4 Go! The bike is super light, rides great and the switch to the gear shift was surprisingly quick. You can see the high-quality workmanship, and it's really fun even on longer trips. We would buy again anytime.

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A bike with no frills that does what it should!

The Woom GO 4 impresses us with its optimal geometry and resulting ergonomics for our children. It is easy and intuitive to use. The bike is pleasantly light and has a simple, functional design that is very appealing.

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Just Woom

Our son learned to ride a bike with Woom and since then he only wants a Woom bike.

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Best bike ever!

Without a doubt the best children's bike ever. It's stable, light and beautiful!

This review was written in exchange for a reward, such as a discount. The incentive was offered regardless of the rating or sentiment of the review.
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Our child loves his Woom GO 4

We have the Woom GO 4 and are very satisfied so far. The switch to the larger wheel size worked without any problems. We particularly like the low weight, which makes it easy for our child to handle the bike themselves. Even longer trips are fun because it is pleasant to drive. The workmanship makes a high-quality impression and the circuit is easy for children to use. The price may not be low, but the quality and driving pleasure justify it for us. Overall, a clear recommendation.

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Bye bye balance bike...

... and off you go for the first real bike! Our son is more of a “couch potato” type, but he has actually discovered cycling for himself. Until then, he didn't want to part with his balance bike, but switching to this bike actually worked — as you often hear! He has learned to ride a bicycle in less than ten minutes and would like to go on a trip every day. :D Clear purchase recommendation!

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Super bike but unfortunately no chain guard

It is a really good bike. We have already bought 5 Woom bikes and are always very satisfied. Unfortunately, this size does not have a chain guard, making other pants or skirts oily quickly.

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Absolutely top

Our “little one” can handle your 4-way zoom perfectly. She gets along great and has no problems with the corridors.

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Super stylish, lightweight and functional

Our daughter (7 years old) is absolutely delighted with her Woom bike. The color is beautiful and unisex, the gears are easy to use and the bike is relatively lightweight, which was particularly important to us as we live on the mountain. Our daughter goes all the way up the hill with it and has already been asked by passers-by if she had an engine, because it looks so effortless We would choose a Woom again and again (both children have been riding Woom bikes since the start of their cycling career) and can also recommend it.

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Great lightweight bike

We've been using woom right from the start. Our older daughter is very delicate. In the beginning, we had a heavier bike and therefore learning to ride was difficult. On recommendation, we bought woom and stuck with it. The bikes are lightweight and easy to ride. The children quickly learn how to handle everything correctly. We also really like the colors. Anytime again.

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Traveling with pleasure, our experience with the Woom 4

I absolutely love Woom 4! It is super robust, yet surprisingly light and easy to drive. Before that, my daughter had problems with other well-known bikes that were too heavy and cumbersome. Since we switched to Woom, she has really enjoyed cycling and doesn't want anything else. A clear recommendation for all parents who want to offer their children an easy, safe and fun bike. The customer service also deserves 5 stars. And lastly, it should not be forgotten that you can resell the Woom Super, which makes the high purchase price more than worthwhile

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A TOP bike for kids

Our grandson had wanted it for a very long time, after much deliberation, we granted him the wish and he received it. He was really happy, sat down on it and he did it super fast with the gearshift and likes to drive with it because it is also very easy. The little brother is already asking when he can ride a bike and is looking forward to the day when he gets it ☺️

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World championship five stars

My daughter had difficulty riding the balance bike she always wanted to, but it didn't work out. That's when I heard about Wurm. I bought her the balance bike and what can I say she got on and off that was five years ago. Since then, it's hard to imagine life without a worm wheel. We now drive the Wurm Vier on normal off-road routes and even on the pump track. My daughter loves it. I wouldn't buy anything else.

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Light and robust

Great lightweight children's bike, yet sturdy and sturdy. Our 6-year-old child is doing very well with it and thanks to the gearshift, you can go on really great bike rides. A rather expensive bike, of course, for which you have to buy accessories such as bells, stands, lamps separately. But overall very satisfied.

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