Woom OFF 4
Minimal weight. Maximum fun. The woom OFF 4 (second generation, 2023 model) is an ultralight and durable 20" mountain bike, built for young riders aged 6 to 8 years and 118 - 130 cm tall. Weighing just 8.1 kg, it features...
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Minimal weight. Maximum fun.
The woom OFF 4 (second generation, 2023 model) is an ultralight and durable 20" mountain bike, built for young riders aged 6 to 8 years and 118 - 130 cm tall. Weighing just 8.1 kg, it features a carbon fork for added strength and agility, 9 gears for tackling varied terrain, and disc brakes for maximum stopping power. Designed with child-specific geometry, an ergonomic saddle and grips, tubeless-ready wheels, and a flip-flop stem, the Woom OFF 4 gives kids total control and confidence on their off-road adventures.
Specifications
Frame
Frame material: lightweight, high-quality 6061 T6 aluminum with butted and hydroformed tubes
20″ wheels
Confidence-inspiring handling: an easy-access low top tube, low center of gravity and long wheelbase provide good balance and make for a fun, safe ride
Hard-wearing plastic chainstay protector to prevent scratches
Headset
Fully integrated 1 1/8″ – 1″ headset
Sealed industrial-grade bearings
Handlebars
Wide, lightweight aluminum bars with tapered ends
Width: 570 mm
Rise: 20 mm
Drivetrain
Lightweight forged aluminum 110 mm cranks with
narrow Q-factor
Narrow-wide chainring with 28 teeth
Cassette with 11–32 teeth
Platform pedals made from fiber-reinforced nylon with metal pins for added grip
Cr-Mo axle and sealed industrial-grade ball bearings
Weight
8.1 kg (without pedals)
Gears
9-speed gearing
SRAM X5 trigger shifter
SRAM X5 rear derailleur
Tires
20 x 2.25" Schwalbe Rocket Ron
ADDIX SPEED rubber compound and Tubeless Easy technology
Tubeless-ready
Presta valves
Seatpost
27.2 x 250 mm
Anodized aluminum seatpost with minimum insertion mark
Brakes
Hydraulic disc brakes by Promax
Rotor diameter front/back: 140/140 mm
Ergonomic brake levers designed for children's hands
Weight limit
50 kg (maximum combined weight of bicycle, rider and cargo)
Fork
Lightweight woom carbon fork
Multidirectional carbon fibers for high torsional stiffness
1 1/8″ – 1″ baby taper steerer tube
100 x 15 mm thru-axle
Post mount for disc brake
Stem
Forged aluminum
CNC-machined
Handlebars attached via two clamps
+/-15° flip-flop design to adjust handlebar height
Length: 50 mm
Grips
Child-friendly thanks to small diameter
Ultra comfortable thanks to reinforced contact surface for palms
100% silicone for maximum grip
Lock-on design to eliminate twisting
Wheels
Lightweight, tubeless-ready aluminum rims from Alexrims
Size: 20″
Aluminum hubs with sealed industrial bearings
Thru-axles for maximum torsional strength (100 x 15 mm front / 135 x 12 mm rear)
20 spokes, double-crossed spoking
Aluminum nipples
Saddle
MTB-specific saddle
Trail-ready design
Ergonomic and age-appropriate design to fit the rider's pelvis
Side protection for leaning against walls
Seatpost clamp
Quick-release aluminum seatpost clamp
Extra-long quick-release lever, easy to operate requiring only minimal strength
No risk of turning and/or twisting
Colors
black
terra coppa
Pickup & returns
Ride it through work
Employees and self-employed can lease bikes through o2o, Cyclis, b2bike, Lease a Bike or Joule. It's up to 40% cheaper than buying.
Questions
Something else? Ask us.
Can I test ride before buying?
Yes. Come by the shop in Laeken, Tuesday to Saturday, and try the bikes we have in stock.
Are pedals included?
We provide pedals so you can hit our test track right away. Need help finding the right pair? Foldable, griptape, freeride or clip-in: we've got them all.
Can I change parts or customize the paint?
Saddle, bars, tyres, wheels or a full custom paint job: bring your ideas and we make it happen.
Can I get a special offer or bundle?
Ask us for a tailored offer, including a sweet deal on accessories or a trade-in of your old bike.
Can I lease this bike?
Yes, through your employer or as self-employed via o2o, Cyclis, b2bike, Lease a Bike or Joule. How leasing works.