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woom 4
Bike: 20″ wheels  •  17.9 lbs
Child: 6 - 8 years  •  45″ - 51″ height
$499.00
Color: woom red
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Accessorize Your woom

VIENNA Bell
$12.00
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AIRFLO Bike Pump
$39.00
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TENS Bike Gloves
$19.00
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SNAP Click on Fenders
$49.00
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PICKUP Rack
$49.00
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GLUG Stainless Steel Bottle
$19.00
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woom 4

Gear it up!

The woom 4 introduces the world of gears to kids aged 6 to 8. The woom 4’s eight-speed gearing combined with the easy-to-operate twist shifter opens up a whole new world of discovery on two wheels. The superlight frame combined with kid-specific geometry creates a comfortable riding experience and gives your Rider more confidence. Being able to ride longer distances and climb bigger hills means your child can go where they’ve never gone before.

Size: 20″ wheels
Weight: 17.9 lbs
Age: 6 - 8 years
Height: 45″ - 51″ height
Available editions:
ORIGINAL
woom 4 - Top Features

  • Lightweight Aluminum Frame

    Geometrically designed for kids six and up and forged of sturdy superlight aluminum, the frame is the heart of the bike. The low standover makes getting on and off the bike easy. The light weight means your Rider can go further, faster, and higher than ever before.

  • Easy-To-Use Gearing

    As your child moves up from a single-speed to a geared bike, they will shift into a new level of biking. The woom 4’s eight-speed gearing in combination with the easy-to-operate twist shifter allows any Rider to conquer the biggest hill in their neighborhood. A narrow-wide chainring ensures minimal chain slippage, provides more control and will have your Rider confidently cruising down the block.

  • Adjustable Vario Stem

    Kids grow fast and need a bike that adapts with them. The Vario stem is constructed of lightweight forged aluminum, making it quickly and easily adjustable. Our Vario stem allows your Rider to optimize their riding position as they become taller. By extending the reach of the handlebars, the life of the bike is also extended.

  • Safety-Focused Brakes

    With climbing big hills come big descents. The woom 4 comes with independently operated front and rear V-brakes to ensure that whether your Rider is zooming down that big hill they conquered or making their first foray off the pavement, they can always control the bike safely.

  • Ergonomic Contact Points

    Comfort is very important to the riding experience, and that's why the contact points on our bike are made specifically for kids. Our saddle is designed to accommodate the anatomy and the biomechanics of growing Riders. Our grips are ergonomically designed for kids' hands. The pedals are durable, reflective, and slip-resistant.

  • Tailor-Made Wheels

    The woom SOOPA DOOPA HOOPS are specially designed for the child-specific geometry on the woom 4 and feature our smooth, frictionless hubs and double-walled rims. The rims come with a 20 stainless steel spoke design to offer a perfect balance of strength and light weight.

  • High-Quality Tires

    The high-quality Schwalbe Little Joe tires provide plenty of traction and durability. The 20” diameter, 1.4″ width tires width tires allow your Rider to traverse both pavement and dirt with plenty of control. The reflective sidewalls of the tires give them further visibility on darker rides.

kid safe plus
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

woom 4

Bike Geometry

Wheel size
20″
Handlebar height
30.3″
Steering angle
68°
Top tube horizontal
17.5″
Wheelbase
32.5″
Seat tube angle
71.5°
Minimum saddle height
22.1″
Maximum saddle height
27.9″
Crank length
4.3″
Handlebar adjustability
individually adjustable
Stand-over height
19.5″

woom 4

Specifications

Frame
  • Made from light, high-quality AA 6061 aluminum material
  • Geometrically designed with 20” wheels with agile and easy handling in mind
  • Low entry, lower sitting position, and forgiving steering geometry provide control and comfort
Gears
  • 8 speeds
  • SRAM X4 twist shifter
  • SRAM X4 rear derailleur
Wheels
  • Ultralight SOOPA DOOPA HOOPS aluminum rims
  • Aluminum hubs with sealed bearings and mounts for woom click-on fenders
  • Quick-release skewers for easy installation and removal
  • 20 lightweight, stainless steel spokes, double-crossed spoking
Fork
  • Light unicrown fork made out of aluminum
  • 1″ shaft
  • Generous trail angle for easy handling
Tires
  • 20 x 1.4″ Schwalbe Little Joe folding tires – woom edition
  • High-quality, light tires for low rolling resistance and maximum grip
  • Schrader (car-type) valves
  • Reflective striping on tire sidewall for optimal visibility even in low-light conditions
Headset
  • Fully-integrated 1″ headset
  • Sealed industrial bearings
  • Integrated ahead clamp
Stem
  • Lightweight stem made out of forged aluminum
  • Adjustable height and reach mean the stem can be adjusted for optimal riding position as the child grows.
  • Handlebars attached via two clamps and fixed with two 5 mm hex bolts
Saddle
  • Ergonomically designed to fit children's pelvis
  • Non-toxic
  • Side protection to lean against walls
Handlebars
  • Wide, ergonomically adapted, light aluminum bars offer more control
  • Sandblasted and black anodized
  • Width: 54 cm
Seatpost
  • Anodized aluminum
  • Safety plug at the bottom
  • Maximum saddle height adjustability thanks to the open seatpost design
Grips
  • woom Ergogrip – designed specifically for kids’ hands
  • Ergonomically formed gripping surface, non-toxic
  • Handlebar ends with extra-large diameter for greater protection
  • Screw-in grips ensure secure attachment to handlebars
Seatpost Clamp
  • Secure aluminum seatpost clamp eliminates risk of turning/twisting
  • Extra-long quick-release skewer makes it easier for kids to release and close
Drive
  • 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 V-brakes with braking power adapted for children
  • Brake levers are ergonomically adapted, reach-adjustable, and suitable for kids’ hands
  • High-quality Jagwire cables provide reduced friction and smooth performance
Colors
  • woom Red, Sky Blue, woom Green, Sunny Yellow, Purple Haze
Weight
  • 17.9 lbs / (8.1 kg)
Weight Limit
  • 155 lbs (70 kg)
Enclosed Tools
  • 15 mm spanner for pedals
  • 5 mm hex key for stem
Shipping Details
  • Box dimensions: 43.7” x 23.2” x 6.9”
Time to assemble!

Any questions on assembly? We will be glad to help you out anytime!
Contact us via phone, email, or chat.

Assembly instructions
PDF / 1.6 MB
Instructions for use
PDF / 1.4 MB
Contact us