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woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
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Bike  20" • 7,4 kg
Child  6 - 8 years • 115 - 130 cm
€ 419,-
Ready to ship same or next business day

The intro to gears!

The woom 4 is very dynamic. The next step is shifting; all 8 gears greatly expand the bike's range of application. Whether in the woods or on the hill, kids can now explore lots more – beyond their horizons!

Size: 20"
Weight: 7,4 kg (without Pedals)
Age: 6 - 8 years
Height: 115-130 cm
Available Editions:

woom brake

woom bikes are equipped with two individual V-brakes. The levers are suited to fit small hands. Safely stopping requires little braking effort.

All components that are specifically designed with safety in mind have 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

  • A Tire/Wheel 20 Zoll
  • B Cockpit/Handlebar Reach 770 mm (30.32")
  • C Steering Angle 68°
  • D Top Tube Horizontal 446 mm (17.56")
  • E Wheelbase 825 mm (32.48")
  • F Seat Tube Angle 71.5°
  • G Minimum Saddle Height 560 mm (22.05")
  • H Maximum Saddle Height 710 mm (27.95")
  • I Crankarm Length 110 mm (4.33")
  • J Handlebar Adjustment individually adjustable


  • frame material: light, high quality Aluminum alloy 6061 with seamless tubes
  • 20" wheels and easy handling: low entry and very low sitting position, a long wheel base and forgiving steering geometry to provide good balance and thus more riding fun
  • light unicrown fork made out of aluminum
  • 1” shaft
  • self-aligning for easy stearing
  • fully-integrated 1" headset
  • sealed industrial bearings
  • integrated ahead clamp
  • forged aluminum
  • our new Vario stem makes the bike not only higher but also longer. The bike grows with the child.
  • handlebar fixed with 2 clamps and bolted with 2 x 5 mm Allen-key
  • wide, ergonomic and lightweigt with a slight rise for more control
  • sandblasted / black anodized
  • 580 mm width
  • reduced diameter suitable for tiny hands
  • non-toxic
  • screw in bar end plugs
  • light, forged 110 mm aluminum cranks with a narrow Q-factor (width between the pedals)
  • gearing: 29 x 11-28T
  • plastic platform pedals
  • sealed cartridge
  • V-brakes
  • 2 brake levers with reach adjustability to fit small hands
  • high-quality Jagwire cables for reduced friction and smooth performance
  • 8-speed
  • SRAM grip shifters
  • SRAM X4 derailleur
  • ultralight Soopa-Doopa-Hoops aluminium rims
  • aluminum hubs with sealed bearings
  • quick-releases to install and remove wheels
  • 20 stainless spokes, 2x laced
  • 20 x 1.4" Schwalbe LITTLE JOE Perf low-resistance tires for good damping, low rolling resistance and good grip
  • car-type valve for easy filling at each service station
  • reflective strips for better visibility
  • age-specific ergonomic design
  • non-toxic
  • additional added protection to lean on walls
Seat Post
anodized aluminum post withinsertion marks that indicate minimal and maximal insertion depths
Seat Post Clamp
  • aluminum / quick-release
  • long lever that is easy to use
  • does not twist when tightened
Enclosed Tools
  • 5 mm hex key for stem
  • 15 mm pedal spanner
7.3 kg (without pedals)
woom red, sky blue, woom green, purple haze, sunny yellow
Shipping Dimensions
104 x 55 x 22 cm
Weight limit
70 kg

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


woom bikes grow with you

Kids grow fast but we still want your child to have a bike with the correct size, and, that you don't have to pay more than a compromise. For this reason, we came up with the upCYCLING system.

  • Exchange your old bike and recieve a 40% reimbursement for it when buying the next size up
  • Lifetime upCYCLING membership (you only pay once)
  • The bike must be roadworthy
  • We'll organize the return shipping on your old bike at no cost


Customer Reviews

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