Woom OFF AIR 4 - Kid Mountain Bike (20")
Rare AIR
The newly upgraded 20" woom OFF AIR 4 will take its Rider beyond the beginning stages of their mountain biking journey. Stable, responsive, and equipped with a high-performance front suspension system, durable components, and tubeless-compatible rims and tires, it provides best-in-class value in its category. Off-road capable and kid-tested, this mountain bike was ergonomically designed for growing bodies and developing abilities. The woom OFF AIR 4 is more than capable on cross-country trails yet, uncompromising on gravel, pavement, or wherever the spirit leads your Rider.
Size 20″ • 20.9 lbs. - Age 6 - 8 years • 46 - 51″
Specifications
Frame
- Frame material: lightweight, high-quality 6061-T6 aluminum with butted and hydroformed tubes
- 20″ wheels
- Easy-access low top tube to assist dismounting
- Long wheelbase and low center of gravity to aid balancing
- Featuring woom-specific molded chainstay protector
Gears
- 9 speeds
- SRAM X5 trigger shifter
- SRAM X5 rear derailleur
Suspension Fork
- RST SPEX hydraulic air suspension fork with 60 mm travel, adjustable compression, and rebound damping, plus lock-out
- 1 – 1 ⅛″ tapered steerer tube
- 100 x 15 mm thru axle
- Post mount for disc brake
Wheels
- Tubeless-compatible Alexrims wheelset
- Aluminum hubs with sealed industrial bearings
- Thru axles for maximum torsional strength (100 x 15 mm front and 135 x 12 mm rear)
- 20 G14 spokes, double-crossed spoking
- Aluminum nipples
Headset
- Fully integrated 1 – 1 ⅛" headset
- Sealed industrial bearings
Tires
- 20 x 2.25″ Schwalbe Rocket Ron with ADDIX SPEED rubber compound
- Quality mountain bike tires with low rolling resistance, maximum grip, good shock absorption, and excellent durability
- Presta valves, tubeless conversion ready
Stem
- Forged aluminum
- CNC-machined
- Handlebars attached via two clamps
- Rise/drop: +/-15° with flip-flop design to adjust the handlebar height
- Length: 50 mm
Saddle
- Ergonomically designed to fit a child’s anatomy
- Streamlined, mountain-bike-specific saddle design
- Side protection to lean against walls
Handlebars
- Wide, ergonomically adapted and lightweight aluminum bars for more control
- Tapered end to fit a child’s hand
- Sandblasted and silver anodized
- Width: 570 mm
- Rise: 20 mm
Seatpost
- 27.2 x 250 mm
- Anodized aluminum seatpost with insertion marks that indicate the minimum insertion depth
- Quick-release seatpost clamp
Grips
- Child-friendly because of a small diameter
- Single-clamp grip to prevent twisting
- Safety zone: extra rubber on the palm-facing portion of the grip for added comfort
- 100% silicone for maximum grip
Seatpost Clamp
- Quick-release seatpost clamp for easy adjustments
- Made from aluminum
Drivetrain
- Lightweight, forged aluminum, 4.3" (110 mm), kid-specific 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 fiber-reinforced nylon
- Chromoly axle and sealed industrial ball bearings
Brakes
- Hydraulic disc brakes by Promax
- Rotor diameter front/back: 140/140 mm
- Ergonomic brake levers designed for a child’s hands
Weight
- Bike weight: 20.9 lbs
- Max weight: 110 lbs combined weight of the Rider and cargo
Colors
- Black
- Terra Coppa
Enclosed Tools
- 4 mm hex key for the stem and seatpost clamp
- 8 mm hex key for the front wheel and pedals
Shipping Dimensions
45 x 26 x 9”
Assembly Instructions
Your OFF-road adventure can begin shortly!
In just a few steps, your woom OFF will be ready for its first ride. Check out this video to find out exactly what to do.