20''
9 kg (19.84 lbs)
Disc brake, Suspension fork
Age : 6 - 8 years
Woom Bikes
Woom Off Air 4
An ultralight and durable 20" mountain bike with a carbon fork, 9 gears and disc brakes designed for children aged 6 years and over.
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.
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 aluminum 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.
Brakes
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 aluminum 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!
Gears
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.
Tyres
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!
118 - 130 cm (3.87 - 4.3')
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
Gears
- 9 speeds
- SRAM X5 trigger shifter
- SRAM X5 rear derailleur
Fork
- Hydraulic air suspension fork with 60 mm travel, adjustable compression and rebound damping, plus lock-out
- 1 1/8″ – 1″ baby taper steerer tube
- 100 x 15 mm through axle
- Post mount for disc brake
Wheels
- Superlight woom OFF DISCO TEC double-chamber aluminum rims
- Aluminum hubs with sealed industrial-grade 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
Headset
- Fully integrated 1" – 1 1/8" headset
- Sealed industrial-grade bearings
Tyres
- 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
Stem
- Forged aluminum
- CNC-machined
- Handlebars attached via two clamps
- +/-15° flip-flop design to adjust handlebar height
- Length: 50 mm
Saddle
- Ergonomically designed to fit children's pelvis
- Side protection to lean against walls
Handlebars
- Wide, ergonomically adapted and lightweight aluminum bars for more control
- Sandblasted and silver anodised
- Width: 600 mm
- Rise: 20 mm
Seatpost
- 27.2 x 250 mm
- Anodised aluminum seatpost with insertion marks that indicate the minimum insertion depth
Grips
- Child-friendly thanks to small diameter
- 100% silicone for maximum grip
- Screwed-in end plugs
Seatpost Clamp
- Made from aluminum
- No risk of turning and/or twisting
Drive
- Lightweight, forged 110 mm aluminium cranks with narrow 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
Brakes
- Hydraulic disc brakes by Promax
- Disc diameter front/back: 140/140mm
- Ergonomic brake levers designed for children's hands
Weight
- 9kg / 19.8 lbs (without pedals)
Colours
- black
All Order over 200Eur are shipped for FREE in most of Europe! More information at the checkout!
All products can be returned within 14 days! Please read return policy for more details!
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