Name: woom OFF AIR 4 - Kids’ bike - 20 inches - 6 – 8 years - terra coppa
Brand: woom
SKU: 5017020112045
Price: 4995.00 RON
Availability: LimitedAvailability
Rating: 4.7 (6 reviews)

Child-specific geometry

Side front view of the woom OFF AIR 4 mountain bike for children aged 6 years and up.

From the age of 6 and up

Detailed view of the front Schwalbe mountain bike tire on the woom OFF AIR 4 children's mountain bike.

Premium suspension fork

Detailed view of the flip-flop stem on the woom OFF AIR 4 children's mountain bike.

Height-adjustable stem

Detailed view of the saddle on the woom OFF AIR 4 children's mountain bike.

Ergonomic saddle

Detailed view of the front disc brake on the woom OFF AIR 4 children's mountain bike.

Powerful disc brakes

Detailed view of the SRAM X5 rear derailleur on the woom OFF AIR 4 children's mountain bike.

Smooth shifting from SRAM

Detailed view of the right-hand grip and trigger shifter on the woom OFF AIR 4 children's mountain bike.

Child-specific MTB grips

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woom OFF AIR 4

The ultralight and durable 20″ mountain bike with front suspension, 9 gears and disc brakes designed for children aged 6 years and over.

Almost sold out - don't hang around!

OFF OFF AIR

Colour: terra coppa

Free returns incl. VAT plus shipping 4.995,00 RON

Free Returns
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Two-year Warranty
Award-winning Design

Size: 20″

Weight: 9,2 kg (20,3 lb)

Top features: Child-specific geometry, air-sprung suspension fork, ergonomic saddle, disc brakes, tubeless-ready wheels, flip-flop stem

Age: 6 – 8 years

Height: 118 - 130 cm (46 - 51 in)

Find the right bike

Welcome to the world of flow!

The next-generation woom OFF AIR 4 is an ultralight, durable hardtail mountain bike with serious all-terrain capabilities for kids aged six and up. With high-quality front suspension and powerful disc brakes, it teams maximum comfort with full control for the ultimate performance on XC trails, gravel tracks, tarmacked lanes and beyond.

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 centre of gravity and long wheelbase provide good balance and make for a fun, safe ride
Hard-wearing plastic chainstay protector prevents scratches

Gears

9-speed gearing
SRAM X5 trigger shifter
SRAM X5 rear derailleur

Fork

Aluminum air-sprung suspension fork from RST
Rebound and compression damping adjustment, plus lockout function
60 mm travel
1 1/8″ – 1″ baby taper steerer tube
100 x 15 mm thru-axle
Post mount for disc brake

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

Headset

Fully integrated 1 1/8″ – 1″ headset
Sealed industrial-grade bearings

Tires

20 x 2.25" Schwalbe Rocket Ron
with ADDIX SPEED rubber compound and Tubeless Easy technology
Tubeless-ready
Presta valves

Stem

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

Saddle

MTB-specific saddle
Trail-ready design
Ergonomic and age-appropriate design to fit the rider's pelvis
Side protection to lean against walls

Handlebars

Wide, lightweight aluminum bars with tapered ends
Width: 570 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
Ultra comfortable with reinforced contact surface for palms
100% silicone for maximum grip
Clamped design to eliminate twisting

Seatpost clamp

Quick-release aluminum seatpost clamp
Extra-long quick-release lever, easy to operate requiring minimal strength
No risk of turning and/or twisting

Drivetrain

Lightweight forged aluminum cranks
110 mm length, 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

Brakes

Hydraulic disc brakes by Promax
Disc diameter (front/back): 160/140 mm
Ergonomic brake levers designed for children's hands

Included tools

4 mm hex key for stem
8 mm hex key for front wheel and pedals

Weight

9.2 kg (without pedals)

Weight limit

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

Colors

black
terra coppa

Shipping dimensions

112 x 64 x 23 cm

Our woom bikes don't come with any additional accessories. You need to add optional extras like kickstands and mudguards on our equipment page.

If your child plans on cycling on public roads and streets, their bike may need to meet certain standard requirements before it can be considered legal in your country of residence. In many countries, bikes must be equipped with a bike bell, front and rear lights, and wide-angle Z reflectors. As rules for cyclists and their equipment vary from country to country, find out about the regulations applicable to riding a woom bike in road traffic in your country or region, particularly regarding the use of lights, reflectors and other obligatory safety equipment.

Superlight Frame

The superlight aluminum frame has capable off-road geometry with a long wheelbase and slack head angle for improved stability and smooth, responsive handling. Extra confidence comes from the kink in the top tube, which makes it easy to dismount quickly in any situation.

Premium suspension fork

Comfort and control on the bumpiest terrain is a given thanks to the fully tunable suspension fork, which can be adjusted to the rider’s weight. With adjustable compression and rebound damping, the fork can be tuned precisely for any terrain or conditions and features a lock-out function that basically switches off the suspension when not needed – meaning full fun on the trails and a faster ride up hills or on the way home!

Ergonomic contact points

The age-appropriate MTB saddle and ergonomically profiled handlebar grips add comfort, while the hard-wearing platform pedals with metal pins provide the necessary grip for all-terrain riding.

Precise shifting

The precise and intuitive SRAM X5 drivetrain has nine gears and a wide gear range thanks to the 28-tooth chainring up front and an 11–32 cassette at the rear. The easy-to-operate trigger shifter operates smoothly and reliably to make light work for children’s thumbs.

Reliable disc brakes

Easy-to-modulate disc brakes are teamed with child-specific, reach-adjustable brake levers to provide maximum stopping power and control in every situation including steep slopes and wet conditions.

Grippy tubeless-ready MTB tires

High-quality Schwalbe mountain bike tires combine low rolling resistance with superior grip and proven durability. With Tubeless Easy technology and tubeless-ready rims, it’s a straightforward transition to go tubeless and benefit from added comfort and grip.

Lightweight flip-flop stem

Specially developed from forged aluminum, this stem pairs the ultimate stiffness with the lowest possible weight. Thanks to its flip-flop design, there’s the option to raise the height of the bars simply by inverting it.

Our standard 2-year warranty applies to the frame and components automatically from the day you purchase your woom bike. Members of our woom Riders Club can extend the warranty on aluminum frames, rigid forks, handlebars, stems and cranks to 10 years for free by registering their bike within 9 weeks of buying it.

Click here to join the woom Riders Club.

Click here to find out more about our extended warranty and to read the full terms and conditions.

Ratings & Reviews

4.70Based on 6 reviews

Top bike18 days ago

So our child absolutely enjoys it! The price may be a bit excessive, but okay. Built-in components are really good. I think it's a shame that there are no original fenders for it!

Automated AI translation

Woom Off Air 5 - absolutely brilliant06/10/2025

We bought the woom 5 for our son. It is well thought out down to the last detail — light, sturdy, safe. As a former cyclist, I immediately see what's right here: Geometry, brakes, sitting position — everything is neatly intertwined. You can tell that there were people at work who take children seriously. The service was also quick and friendly. A product that delivers what it promises.

Automated AI translation

Woom Off Air 429/09/2025

Our son loves the Woom Off Air and gets along great with it. Top workmanship and appearance. Dispatch and delivery went smoothly. Unfortunately, there is a star deduction for the very high price.

Automated AI translation

04/09/2025

My son rides this bike and is super happy with it - that's why we've been cycling a lot more often lately. Whether just to the outdoor pool or along the dirt roads and hills in the surrounding area. He enjoys both. Clear recommendation!

Automated AI translation

The Best Bike Ever 19/07/2025

Great air suspension great tires and every thing about this bike is just so so good but just maybe a little bit over priced but that doesn’t make the bike worse even though I don’t have it does not mean I can’t love it

woom OFF AIR 4

Welcome to the world of flow!

Specifications

Geometry

Simple assembly for simple rides

What's in the box?

Features & Highlights

Guarantee information

Legal right to cancel goods & services

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Ratings & Reviews