Woom

OFF AIR 4 20in Mountain Bike - Kids'

What Our Gearhead® Experts Are Saying:

"I evaluated the woom OFF AIR 4 across uneven terrain, small trail features, and rolling climbs, and the suspension setup stands out immediately. The air fork with rebound, compression, and lockout adds real tunability, while the SRAM X5 9-speed drivetrain shifts cleanly under load. Hydraulic disc brakes provide reliable modulation, and the tubeless-ready wheelset with high-volume tires improves grip and ride quality for developing trail riders"

Who It’s For

Developing mountain bike riders ready for suspension tuning and trail progression

The woom OFF AIR 4 is designed for riders advancing into more technical off-road riding who benefit from added front suspension and improved traction. It supports riders learning to manage body position, absorb trail feedback, and maintain control across uneven terrain

Riders pushing into longer trail rides, small descents, and rougher surfaces will benefit from its adjustable suspension and stable geometry, making it a strong option for both progression and sustained use as skills improve

What It’s For

Cross-country and light trail riding with suspension support

This bike is best suited for hardpack, loose-over-hard trails, rooty sections, gravel, and uneven terrain where front suspension improves traction and comfort. The air fork allows tuning for rider weight and terrain, while the lockout adds efficiency on smoother sections and climbs

With tubeless-ready wheels, 2.25in tires, and a 9-speed drivetrain, the OFF AIR 4 is well equipped for riders tackling varied trail conditions, longer rides, and more technical terrain compared to rigid setups

Why We Like It

Lightweight suspension hardtail with real tuning capability

The frame uses butted and hydroformed 6061 T6 aluminum to keep weight low while maintaining durability for repeated trail use. Its low top tube, long wheelbase, and stable geometry create a confidence-inspiring ride feel that helps riders stay balanced and in control. The addition of a 60mm air-sprung suspension fork brings a noticeable improvement in comfort and front-end traction, while maintaining efficiency with a lockout option for smoother terrain

The component package is thoughtfully trail-oriented. SRAM X5 shifting provides a reliable 9-speed range with an 11-32T cassette, supporting climbing and speed control. Promax hydraulic disc brakes with a 160mm front rotor and 140mm rear rotor improve braking power and modulation across varied conditions. Tubeless-ready Alexrims wheels, thru-axles, and Schwalbe Rocket Ron 2.25in tires enhance grip, stability, and ride quality, while ergonomic grips and a flip-flop stem refine fit and control

This bike is best for riders stepping into more technical trail riding who benefit from suspension support without the complexity of a full suspension setup. It is ideal for cross-country riding, skill progression, and riders who want more comfort and control on rough terrain while maintaining a lightweight, efficient platform

Heads up - We do our best to keep bike specs and images current, but occasional component changes can happen without warning-and sometimes the photos might not show the exact build you'll receive. If you want to double-check the details, our Gearheads are always here to help.