Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Woom
2025 Woom OFF AIR 4
Previous used estimate
$845 - $869
Actual value depends on condition, size, and local demand.
Value Guide market data · 2025 Woom OFF AIR 4
12-month projected trend
20%
Direction and magnitude, not judgment
vs. category average
3%
Holds value better than category avg
Price over time - 2025 Woom OFF AIR 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All OFF model years
Compare OFF AIR 4 models
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Overview
About this bike
The ultralight and durable 20" mountain bike with front suspension, 9 gears, and disc brakes is designed for children aged 6 years and over. 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
- Subtype
- 20-inch
- Category
- Kids
- Component Fork
- RST SPEX hydraulic air suspension fork with 60 mm travel, adjustable compression, and rebound damping, plus lock-out 1 – 1 1/8" tapered steerer tube 100 x 15 mm thru axle Post mount for disc brake
- Component Size
- 20-inch
- Component 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
- Product Family
- OFF
- Component Color
- Black, Terra Coppa
- Component 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
- Component Brakes
- Hydraulic disc brakes by Promax Rotor diameter front/back: 140/140 mm Ergonomic brake levers designed for a child’s hands
- Component Saddle
- Ergonomically designed to fit a child’s anatomy Streamlined, mountain-bike-specific saddle design Side protection to lean against walls
- Component Headset
- Fully integrated 1 – 1 1/8" headset Sealed industrial bearings
- Component Crankset
- 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
- Component Seatpost
- 27.2 x 250 mm Anodized aluminum seatpost with insertion marks that indicate the minimum insertion depth Quick-release seatpost clamp
- Component Shifters
- 9 speeds, SRAM X5 trigger shifter
- Component Handlebar
- 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
- Component Rear Tire
- 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
- Component Wheel Set
- 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
- Component Front Tire
- 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
- Component Tape 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
- Component Rear Derailleur
- SRAM X5 rear derailleur
- Crankset
- 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
- Seatpost
- 27.2 x 250 mm Anodized aluminum seatpost with insertion marks that indicate the minimum insertion depth Quick-release seatpost clamp
- Saddle
- Ergonomically designed to fit a child’s anatomy Streamlined, mountain-bike-specific saddle design Side protection to lean against walls
- Handlebar
- 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
- Headset
- Fully integrated 1 – 1 1/8" headset Sealed industrial bearings
- Rear Derailleur
- SRAM X5 rear derailleur
- Rear Tire
- 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
- Brakes
- Hydraulic disc brakes by Promax Rotor diameter front/back: 140/140 mm Ergonomic brake levers designed for a child’s hands
- Fork
- RST SPEX hydraulic air suspension fork with 60 mm travel, adjustable compression, and rebound damping, plus lock-out 1 – 1 1/8" tapered steerer tube 100 x 15 mm thru axle Post mount for disc brake
- 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
- Shifters
- 9 speeds, SRAM X5 trigger shifter
- Tape/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
- Color
- Terra Coppa
- Size
- 20-inch
- Wheel Set
- 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
- Front Tire
- 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
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.