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woom OFF 4 (Newest Model)

NEWPerspective view of the OFF 4 (Newest Model) Bike
Lightweight Aluminum Frame
NEWFrontal view of black handlebars on the OFF 4 (Newest Model) bike
Trail-Tuned Cockpit
NEW9-speed Gear of the OFF 4 (Newest Model) Bike
Ergonomic Trigger Shifter
NEWBlack handlebar grip of the OFF 4 (Newest Edition) bike
Child-Specific Brake Levers
NEWBrakes for the OFF 4 (Newest Edition) bike
Innovative Braking System
NEWSchwalbe black tires of the OFF 4 (Newest Edition) bike
High-Quality Tires
NEWBlack saddle of the OFF 4 (Newest Edition) bike
Ergonomic Contact Points
NEWBlack Rear Derailleur of the OFF 4 (Newest Edition) bike
Clutch Rear Derailleur
NEWBlack chain cover for the OFF 4 (Newest Edition) bike
Wide-Range 9-Speed Drivetrain
NEWBlack frame of OFF 4 (newest edition) bike with gold woom logo
Low Standover Frame Geometry
NEWStem for the saddle of the OFF 4 (Newest Edition) bike
Flip-Flop Stem
1/11
woom OFF 4 (Newest Model)
  • The ultralight 20" woom OFF 4 features a carbon fork and child-specific ergonomics built for light singletrack and off-road paths. Featuring our latest component updates and refined engineering for young mountain bikers aged 6 and up.
  • Looking for our previous version? Use the selector below to toggle between the Newest Model and our 2023 Model.
In stock & delivered in 2-3 business days
Newest Model2023 Model
color: treasure black
Price:$949.00

  • Lightweight for Easy Learning
  • Quick and Simple Assembly
  • Worry-Free 30 Day Returns
  • Built for Kids and Built to Last
Size: 20″
Weight: 18.9 lb
Top features: child-specific geometry, carbon fork, ergonomic saddle, disc brakes, tubeless-ready wheels, flip-flop stem, clutch derailleur
Age: 6 – 8 Years
Height: 46 - 51 in
Find the right bike

OFF The Charts

There’s no better introduction to riding off-road than the woom OFF 4. Built for real trail capability, this updated release pairs an ultralight carbon fork with smooth 9-speed clutch shifting to eliminate chain slap on rough terrain. Stable, responsive, and equipped with tubeless-compatible rims and child-specific ergonomics, it is happiest venturing down gravel paths, up dirt mountain trails, or through singletrack. Finished in stealthy treasure black with refined matte accents.  

Specifications

Frame

  • Frame material: lightweight, high-quality 6061-T6 aluminum with butted and hydroformed tubes
  • 20″ wheels
  • Easy-access low top tube to assist dismounting
  • Long wheelbase and low center of gravity to aid balancing
  • Featuring woom-specific molded chainstay protector 

Gears

  • Precise, Kid-Centric Shifting 
  • MicroSHIFT Advent 9-Speed with fine-tuned gear ratios for every size
  • MS Advent Trigger SL-M6195-R with short-reach rubber pad levers. Lower shifting force to quickly and effortlessly change gears.
  • Active Motion Clutch eliminates chain slap and prevents chain drops for whisper-quiet rides without interruption.
  • Short cage rear derailleurs for maximum ground clearance:

Fork

  • Lightweight woom carbon fork
  • Multidirectional carbon fibers for high torsional stiffness
  • 1 1/8″ – 1″ baby taper steerer tube
  • 100 × 15 mm thru-axle
  • Post mount for disc brake

Wheels

  • Lightweight aluminum rims from Alexrims
  • Size: 20″
  • Aluminum hubs with sealed industrial bearings
  • Thru-axles for maximum torsional strength (100 × 15 mm front / 135 × 12 mm rear)
  • 20 spokes, double-crossed spoking
  • Aluminum nipples

Headset

  • Fully integrated 1 – 1 ⅛" headset
  • Sealed industrial bearings

Tires

  • 20 × 2.25" Schwalbe Rocket Ron Performance ADDIX GREEN - combines speed and cornering control at the highest possible level. Cleverly designed tread balanced for low rolling resistance while remaining grippy
  • Presta valves

Stem

  • Forged aluminum
  • CNC-machined
  • Handlebars attached via two clamps
  • Rise/drop: +/-15° with flip-flop design to adjust the handlebar height
  • Length: 50 mm

Saddle

  • Ergonomically designed to fit a child’s anatomy
  • Streamlined, mountain-bike-specific saddle design 
  • Side protection to lean against walls

Handlebars

  • Wide, ergonomically adapted and lightweight aluminum bars for more control
  • Tapered end to fit a child’s hand
  • Sandblasted and silver anodized
  • Width: 570 mm
  • Rise: 20 mm

Seatpost

  • 27.2 x 250 mm
  • Anodized aluminum seatpost with insertion marks that indicate the minimum insertion depth
  • Quick-release seatpost clamp

Grips

  • Child-friendly because of a small diameter
  • Single-clamp grip to prevent twisting
  • Safety zone: extra rubber on the palm-facing portion of the grip for added comfort
  • 100% silicone for maximum grip

Seatpost Clamp

  • Quick-release seatpost clamp for easy adjustments
  • Made from aluminum

Drivetrain

  • Lightweight forged aluminum 110 mm cranks with
    narrow Q-factor
  • Narrow-wide chainring with 28 teeth
  • Cassette with 11–36 teeth
  • Platform pedals made from fiber-reinforced nylon with metal pins for added grip
  • Cr-Mo axle and sealed industrial-grade ball bearings

Brakes

  • Hydraulic disc brakes Tektro HD-J3120 
  • Rotor diameter front/back: 140/140 mm
  • Ergonomic short-reach brake levers designed for children's hands

Enclosed tools

  • 4 mm hex key for the stem and seatpost clamp
  • 8 mm hex key for the front wheel and pedals

Weight

  • Bike weight: 18 lbs 15 oz
  • Max weight: 110 lbs combined weight of the Rider and cargo

Weight limit

50 kg (maximum combined weight of bicycle, rider and cargo)

Colors

  • Treasure Black

Shipping dimensions

45 x 26 x 9”

Sizing Chart

Model

Inseam

Height

woom OFF 422.8″ - 28.7″46″ - 51″
woom OFF 527.8″ - 33.7″50″ - 57″
woom OFF 630.3″ - 37.8″55″ - 65″
woom OFF AIR 422.8″ - 28.7″46″ - 51″
woom OFF AIR 528.3″ - 34.3″50″ - 57″
woom OFF AIR 630.7″ - 38.2″55″ - 65″

Unsure how to measure inseam? Can't decide between two sizes? Check out our What Size is Right?article

Geometry

Guarantee

The woom 10-year warranty

Inspiring children to love riding their bikes is our mission at woom. That's why we guarantee the premium quality of every bike down to the last detail with innovative technology and long-lasting materials.

We have full confidence in our bikes, which is why we offer a 10-year warranty on the aluminum frames, rigid forks, bars and stem once you've registered online.

Register now!

Returns

30-Day Return Policy (WOW 60-Day Return Policy)

If you buy a product directly from us that does not meet your expectations for any reason, you can return it within 30 days (WOW 60 days) of the purchase — no questions asked. We will refund the full cost of the product and pay to have it shipped back to woom. Please note: We are unable to refund the original shipping cost from when you first purchased the product. The refund for the cost of the product and return shipping cost will be processed within 5-7 business days upon receiving the shipment.

Return Procedures

If you are returning a product, please initiate a return by clicking the link below. Please read through the following tips if you are returning multiple items or upcycling to ensure your return process goes as smoothly as possible. Thank you!

Keys to Success

  1. If you are returning a combination of any of the following items that cannot fit in the same box, please do this in 2 separate returns. Items include: Any model bike, helmet, rack, freewheel, or fenders. For example, if you are returning a woom bike and helmet/large accessory, one return would contain the bike, and the other return would contain the helmet/ large accessory.
  2. The same rule applies if you are returning multiple bikes. Please do a separate return for each bike.
  3. Please ensure you are choosing the correct reason for return in order to get the correct return label.

Click here for return label

All domestic shipping costs after the initial shipment to you will be covered by us. We will send you a return shipping label and all you have to do is pack it up and bring it to the shipper.

For questions, please email usa@woombikes.com. You can also give us a call at 855-966-6872. We are here to help you.

The woom 10-year warranty

Inspiring children to love riding their bikes is our mission at woom. That's why we guarantee the premium quality of every bike down to the last detail with innovative technology and long-lasting materials.

We have full confidence in our bikes, which is why we offer a 10-year warranty on the aluminum frames, rigid forks, bars and stem once you've registered online.

Register now!

Product Variations

If you spot a difference between the product page and what you received, it’s likely due to a change in our supply chain. Our Customer Experience team is always here to answer any questions that you may have.

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NEEBOWS Knee Pad Set

Let’s face it, kids fall off their bikes sometimes, especially when they’re learning or trying something new. The NEEBOWS Knee Pad Set not only helps you keep your kiddo safer but also boosts your Rider's confidence. They protect little knees without compromising range of motion. These pads are soft and flexible, but they compress upon impact to cushion the fall.

Sizing tips: NEEBOWS are not intended to be worn over clothing. If your child falls in between sizes, size up!

$39.90

Ratings & Reviews

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