Woom Kids' Off Air 4 Mountain Bike 2025

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.

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
• Colors  -  Black, Terra Coppa

*Specifications are subject to change without notice