Woom Off Air 4 20" 9 Speed Kid's Mountain Bike (Recommended for Height 3'10" - 4'3")

The newly upgraded Woom Off Air 4 20 Inch 9 Speed Kid's Hardtail Mountain Bike will take its Rider beyond the beginning stages of their mountain biking journey. The Woom Off Air 4 20 Inch is stable, responsive, and equipped with a high-performance front suspension system, durable components, and tubeless-compatible rims and tires.  The Woom Off Air 4 20 Inch 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.

 

 

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: 21 lbs 11 oz
• Max weight: 110 lbs combined weight of the Rider and cargo

 

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”