woom 4

Bike 20″ • 7,3 kg
Child 68 years • 115130 cm

€ 419,00 419.0 EUR

€ 349,17

incl. VAT plus shipping

Out of Stock

Add to Cart


KIDS' Helmet
€ 69,00
CYCLOPE Bike Lights
€ 40,00
LEGGIE Kickstand
€ 15,00
€ 10,00
€ 10,00
LOKKI Bike Lock
€ 30,00
Gear it up!

The woom 4 introduces children aged six years to the world of gear-shifting. The bike's eight speeds in combination with the easy-to-operate twist shifter expand the bike's range of use and increase the child's mobility. Whether they want to ride their bikes into the woods or up hills – the new-found freedom of gears make longer adventures on two wheels child's play.

  • Size: 20″
  • Weight: 7.3 kg (without pedals)
  • Age: 6 – 8 years
  • Height: 115 – 130 cm
  • Available editions:

- Top Features


The two V-Brakes are easy to operate thanks to their ergonomically adapted brake levers with reach adjustability. The levers require only little strength to bring the bike to a safe halt.

All components that have been specifically designed with safety in mind bear the KIDSAFE PLUS seal.

“There is much more to riding a bike than just the fun of taking it for a spin: exploring the world means broadening horizons.”

Christian Bezdeka Founder of woom

Bike geometry

Tyre/wheel size 20″
Cockpit/handlebar height 770 mm (30.32")
Steering angle 68°
Top tube horizontal 446 mm (17.56")
Wheelbase 825 mm (32.48")
Seat tube angle 71.5°
Minimum saddle height 560 mm (22.05")
Maximum saddle height 710 mm (27.95")
Crank length 110 mm (4.33")
Handlebar adjustability individually adjustable


  • Frame material: light, high-quality AA 6061 aluminium with butted tubes
  • 20″ wheels
  • Agile yet easy handling: low entry, very low sitting position and forgiving steering geometry to provide good control and more riding fun
  • 8 speeds
  • SRAM X4 twist shifter
  • SRAM X4 rear derailleur
  • Light unicrown fork made out of aluminium
  • 1″ shaft
  • Generous trail angle for easy handling
  • Ultralight SOOPA DOOPA HOOPS aluminium rims
  • Aluminium hubs with sealed bearings
  • Quick-release skewers for easy installation and removal
  • 20 stainless steel spokes, double-crossed spoking
  • Fully-integrated 1″ headset
  • Sealed industrial bearings
  • Integrated ahead clamp
  • 20 x 1.4″ Schwalbe Little Joe folding tyres – woom edition
  • High-quality, lightweight tyres for good shock absorption, low rolling resistance and maximum grip
  • Car-type valves for easy filling at any service station
  • Reflective stripes on the sides of the tyres for optimal visibility even in low-light conditions
  • Lightweight stem made out of forged aluminium
  • Adjustable height and reach mean the Vario stem offers an optimal riding position as the child grows.
  • Handlebars attached via two clamps and fixed with two 5 mm hex bolts
  • Ergonomically designed to fit children's pelvis
  • Non-toxic
  • Side protection to lean against walls
  • Wide, ergonomically adapted and lightweight aluminium bars for more control
  • Sandblasted and black anodised
  • Width: 580 mm
  • Anodised aluminium seatpost with insertion marks that indicate the minimum insertion depth
  • Child-friendly thanks to reduced diameter
  • Non-toxic
  • Screwed-in end plugs
Seatpost clamp
  • Made from aluminium
  • Extra-long quick-release skewer, easy to operate requiring only little strength
  • No risk of turning and/or twisting
  • Lightweight, forged 110 mm aluminium cranks with narrow tread (Q-factor)
  • Beginner gearing: 29 teeth in the front and 11-28 teeth in the back
  • Platform plastic pedals
  • Sealed cartridge
  • Two independently operated V-brakes with braking power adapted for children
  • Ergonomically adapted brake lever with reach adjustability
  • High-quality Jagwire cables for reduced friction and smooth performance
Enclosed tools
  • 15 mm spanner for pedals
  • 5 mm hex key for stem
  • woom red, sunny yellow, woom green, sky blue, purple haze
  • 7.3 kg / 16.09 lbs (without pedals)
Weight limit
  • 70 kg (155 lbs)
Shipping dimensions
  • 104 x 55 x 22 cm

This is how we deliver your bike —
5 min., ready, go!


woom bikes grow with your child

Children grow up fast. Still, we want your child to always have the right size bike – and we think this should be affordable for everyone. That's why we have launched the upCYCLING system.

  • Exchange your old woom bike and receive a 40% discount when buying the next size up.
  • Lifetime upCYCLING membership (you only pay once).
  • The bike must be roadworthy.
  • We'll organise return shipping of your old bike at no cost.

Affordable shipping costs

We offer shipping throughout the EU for €10. If you only order accessories, shipping costs €5.

Quick delivery

We ship within 24 hours of payment being received. Shipments in the EU will be delivered to your door within 1-5 working days.

30 day money-back guarantee

Give your child enough time to test the bike. You can return any bike within 30 days and we'll cover all of the shipping costs.

Unpack and setup

With just a few easy steps your bike will be ready to ride. Check out our videos for tips on setting up your bike.

Personal service

We guarantee personal support when you buy a bike – satisfaction guaranteed!

Protecting the environment

We are partners of the Austrian "klimaaktiv mobil" initiative and are committed to protecting the environment and using resources efficiently.