woom OFF AIR 4

Bike 20″ • 9 kg
Child 68 years • 118130 cm

€ 899,00 899.0 EUR

€ 749,17

incl. VAT plus shipping
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Welcome to the suspension dimension!

The woom OFF AIR 4 offers children aged six years and older an ultralight and robust mountain bike with front suspension that boldly answers the call of all their off-road adventures. The suspension fork dials up comfort to the max and ensures the ultimate control on rough terrain – the result is more fun and less fatigue.

  • Size 20"
  • Weight 9 kg
  • Age 6 - 8 years
  • Size 118 – 130 cm
  • Available editions:
  • OFF and OFF AIR

Get out and explore

Suspension fork

Comfort and control on the bumpiest terrain is a given thanks to the high-quality suspension fork, which can be adjusted to the rider’s weight. Tune the feel of the bike to suit the terrain with adjustable compression and rebound damping, plus lock-out the suspension when needed. These features ensure a good time, whether your child is shredding up the trails or cruising home.

"With the woom OFF and the woom OFF AIR, we are expanding our range to include a mountain bike that makes no compromises when it comes to design and quality."

Marcus IhlenfeldFounder and CEO of woom

Bike geometry

Tyre/wheel size 20"
Cockpit/handlebar height 800 mm (31.5″)
Steering angle 68°
Top tube horizontal 460 mm (18″)
Wheelbase 850 mm (33″)
Seat tube angle 70°
Minimum saddle height 580 mm (22.8″)
Maximum saddle height 730 mm (28.7″)
Crank length 110 mm (4.33″)
Handlebar adjustability Angle +/-15°; Height +/- 12 mm (0.47″)


  • Frame material: lightweight, high-quality 6061 T6 aluminum with butted and hydroformed tubes
  • 20" wheels
  • Sporty handling: an easy-access low top tube, low centre of gravity and long wheelbase provide good balance and make for a fun, safe riding experience
  • 9 speeds
  • SRAM X5 trigger shifter
  • SRAM X5 rear derailleur
  • Hydraulic air suspension fork with 60 mm travel, adjustable compression and rebound damping, plus lock-out
  • 1 1/8″ – 1″ baby taper shaft
  • 100 x 15 mm through axle
  • Post mount for disc brake
  • Superlight woom OFF DISCO TEC double-chamber aluminum rims
  • Aluminum hubs with sealed industrial bearings
  • Through axles for maximum torsional strength (100 x 15 mm front / 135 x 12 mm rear)
  • 20 G14 spokes, double-crossed spoking
  • Aluminum nipples
  • Fully integrated 1" – 1 1/8" headset
  • Sealed industrial bearings
  • 20 x 2.25″ Schwalbe Rocket Ron with ADDIX SPEED rubber compound
  • Quality MTB tyres with low rolling resistance, maximum grip, good shock absorption and excellent durability
  • Car-type valves for easy filling at any gas station
  • Forged aluminum
  • CNC-machined
  • Handlebars attached via two clamps
  • +/-15° flip-flop design to adjust handlebar height
  • Length: 50 mm
  • Ergonomically designed to fit children's pelvis
  • Non-toxic
  • Side protection to lean against walls
  • Wide, ergonomically adapted and lightweight aluminum bars for more control
  • Sandblasted and silver anodised
  • Width: 600 mm
  • Rise: 20 mm
  • 27.2 x 250 mm
  • Anodised aluminum seatpost with insertion marks that indicate the minimum insertion depth
  • Child-friendly thanks to small diameter
  • 100% silicone for maximum grip
  • Non-toxic
  • Screwed-in end plugs
Seatpost Clamp
  • Made from aluminum
  • No risk of turning and/or twisting
  • Lightweight, forged 110 mm aluminium cranks with narrow tread (Q-factor)
  • Narrow-wide chainring with 28 teeth in the front
  • Cassette with 11-32 teeth in the back
  • Flat pedals made from fibre-reinforced nylon
  • Cr-Mo axle and sealed industrial ball bearings
Enclosed tools
  • 4 mm hex key for stem and seatpost clamp
  • 8 mm hex key for front wheel and pedals
  • Hydraulic disc brakes by Promax
  • Disc diameter front/back: 160/140mm
  • Ergonomic brake levers designed for children's hands
  • 9kg / 19.8 lbs (without pedals)
  • black
Shipping dimensions
  • 112 x 64 x 23 cm

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