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Woom 4 Bike

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Product Details

Ready to explore!  

The 20" WOOM 4 with its optimized geometry is built for enhanced riding dynamics. With 8 gears and light off road tires it is ready for adventure, exploring off-road trails and an extended usage.  An innovative geometry designed for 6-9 yr old children 46"-53" tall, this bike weighs in at a light 17.5 lbs (without pedals).

AVAILABILITY:  Sold out.   Purchase the Woom 4 directly from Woom.

What we love about this bike:  

  • How lightweight the bike is - makes it much easier for a child to ride.
  • So easy to shift, perfect for kids who have never done so before
  • An intelligent design, taking into the size and ergonomics of children, to design a bike that makes riding easier and more fun.
  • The “small hand reach” brakes, which enable even the smallest of hands to brake safely and with minimum effort.
  • The high quality of manufacturing. This bike is lightweight yet super durable. Made to last so it can be passed down from child to child or re-sold.
  • Woom is a sustainable company that values safety, ergonomics, handling, design, and non-toxic parts to create environmentally friendly bikes for kids.

"The WOOM4 is the best all-around 20″ bike we have tested.  Rugged and nimble enough for moderate single-track riding, yet comfortable enough for street riding, the WOOM4 is the perfect bike to take your all-terrain rider." Online Bike Review Expert (Two Wheeling Tots)

    Bike Details | Geometry | Assembly & Manuals | Warranty Info




    Frame Material: Light and high quality A-6061 Aluminum - 20" wheel size providing agile yet good natured riding characteristics: low step in height, very low minimum seating position, long wheelbase, very forgiving geometry Set up provides maximum stability, and excellent balance resulting in increased satisfaction - Continuous seat post design allows for maximum saddle height adjustment


    light unicrown fork made out of aluminum - 1" shaft - designed for ease of steering


    semi-integrated 1" headset = sealed ahead set made out of steel and aluminum - integrated ahead clamp


    Forged Aluminum - 40mm - +10° - no protruding screws in this fully integrated and proprietary clamp design - we call it the knee-friendly design - the handlebar is connected with two 6mm bolts
    Handlebar wide, ergonomic, and light aluminum handlebar for more control - BMX style with high rise for maximum adjustability - sand blasted and black anodized - Width: 520mm
    Handles reduced diameter for extra small hands - free of softeners and pollutants - grippy diamond structure - handle bar ends contain rubber plugs for additional cushioning and safety
    Brake Two independent hand brakes (No Coaster Brake) - Mini V-Brake with levers suitable for small hands - brake lever with reach adjustability and ergonomic fit for very small hands - high quality Jagwire bowden cable for low friction and ease of operation
    Crank Light forged aluminum cranks with 110mm length and low Q-Factor (low width between both legs) - Beginner ratio: 32T front and 11-32 rear - plastic pedals - molded cartridge chamber - Easy to operate V Hand brakes
    Shifter 1x8 gears - Microshift twister shifter for ease of shifting - Microshift RD-M45S Shifter with short cage
    Wheels Super light Soopa-Doopa-Hoops Aluminum rims - small Aluminum hubs for extended leg room at the rear wheel - sealed bearing hubs - wheel can be installed and removed with 5mm allen wrench - 20 Niro spokes 1.8 straight spokes
    Tires Kenda Small Block 1,5"x20 light weight low profile balloon tires offer great damping, rolling performance and a lot of grip - Schrader valves (car valves) to inflate easily
    Saddle Age specific and ergonomically designed and molded - Free of pollutant and toxins - side safeguard to lean against wall
    Seat post Anodized aluminum seat post - integrated maximum insertion indicator
    Seat post clamp Aluminum quick release seat clamp with long lever for ease of use and operation - clamp is safely secured against unnecessary movements
    Enclosed tools 1x6mm long allen wrench for headset, 15 wrench for pedals
    Weight 17lb 8oz (7.9kg)


    For bike enthusiasts, here the details:
    A Wheel / Tire size 20" F Wheelbase 825 mm
    B Cockpit / Grip height 745 mm G Crank length 110 mm
    C Steering angle 68° H Seattube angle 71.5°
    D Medium standing height 21.65" (550 mm) I Minimum Seat Height 21.65" (550 mm)
    E Horizontal toptube length 430 mm J Maximum Seat Height 27.6" (700 mm)



    Woom Bikes offers a 5 year Warranty period for frame and fork and 24 months on all components. They cover any obvious defects - not covered are damages caused by crashes or mis-usage of the products. All you need to do is send a picture of the damage and we will help you quickly. In case you break something or get a part stolen from your bike, you can buy all components at cost. Please contact us through email

    Watch an informative video describing Woom's Warranty:

     Woom Warranty

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    Customer Reviews

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