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WOOM woom OFF AIR 4 click to zoom image
WOOM woom OFF AIR 4 click to zoom image
WOOM woom OFF AIR 4 click to zoom image
WOOM woom OFF AIR 4 click to zoom image
WOOM woom OFF AIR 4 click to zoom image
WOOM woom OFF AIR 4 click to zoom image

Out of Stock

*Delivery available within UK mainland only*

woom OFF AIR 4 - 20" wheel suspension kids' MTB

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.

Key Features

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.
woom frame
The superlight aluminium frame with butted hydroformed tubes has a sporty geometry, long wheelbase and flat steering angle. The kink in the top tube makes it easy to dismount quickly in any situation.
The disc brakes with their excellent modulation combined with special brake levers designed for children's hands increase safety and control in all situations, including on rough terrain and in wet conditions.

woom stem
The specially developed stem from forged aluminium guarantees maximum stiffness with minimal weight. Thanks to its flip-flop design it can be turned over and mounted upside down to adjust the handlebar height.
woom saddle
The saddle is one of the most important points of contact between the child and the bike. It significantly affects the feeling when riding. That is why our saddle is designed to fit the pelvis of children in this age group and give them a slightly stretched-out riding position. Perfect for a unique riding experience!
The precise and easy-to-operate gear system allows smooth shifting. The SRAM X5 system has nine gears suitable for a wide range of gradients thanks to 28 teeth in the front and an 11-32 cassette in the back.

The high-quality Schwalbe mountain bike tyres with ADDIX SPEED rubber compound offer an ideal combination of low rolling resistance, maximum grip, good shock absorption and excellent durability.
Trigger shifter
The easy-to-use SRAM trigger shifter allows riders to shift smoothly and reliably through the nine gears using their thumb.
Sticker set
Pimp your bike! Every woom OFF is delivered complete with a set of stickers in four colours. Place them on your rims and top tube to personalise your bike!
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Delivery Information


Frame 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
Forks 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
Rear Derailleur SRAM X5 rear derailleur, 9-speed
Shifters SRAM X5 trigger shifter, 9-speed
Chainset Lightweight, forged 110 mm aluminium cranks with narrow tread (Q-factor)

Narrow-wide chainring with 28 teeth in the front
Freewheel/Cassette 11-32t
Headset Fully integrated 1" - 1 1/8" headset

Sealed industrial bearings
Stem Forged aluminium


Handlebars attached via two clamps

+/-15 degree flip-flop design to adjust handlebar height

Length: 50 mm
Handlebars Wide, ergonomically adapted and lightweight aluminium bars for more control

Sandblasted and silver anodised

Width: 600 mm

Rise: 20 mm
Front Brake Hydraulic disc brakes by Promax, 160mm rotor
Rear Brake Hydraulic disc brakes by Promax, 140mm rotor
Brake Levers Ergonomic brake levers designed for children's hands
Rims Superlight woom OFF DISCO TEC double-chamber aluminium rims
Front Hub Aluminium hubs with sealed industrial bearings

100 x 15 thru axle
Rear Hub Aluminium hubs with sealed industrial bearings

135 x 12 thru axle
Spokes 20 G14 spokes, double-crossed spoking

Aluminium nipples
Tyres 20 x 2.25" Schwalbe Rocket Ron with ADDIX SPEED rubber compound
Saddle Ergonomically designed to fit children's pelvis


Side protection to lean against walls
Seatpost 27.2 x 250 mm

Anodised aluminium seatpost with insertion marks that indicate the minimum insertion depth
Pedals Flat pedals made from fibre-reinforced nylon
Grips Child-friendly thanks to small diameter

100% silicone for maximum grip


Screwed-in end plugs
Weight 9kg
Wheel Size 20"
As with any product, specification is subject to change without prior notification. You are advised to confirm current specification before buying.
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