As capable on cross-country trails as it is on gravel and pavement, the woom OFF AIR 4 kids' mountain bike is ergonomically designed for growing riders to deliver good times that develop their skills.
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- This bike is stable, responsive and equipped with a high-performance front suspension, durable components and tubeless-compatible rims and tires
- This model is updated with a dropper seatpost-ready frame design
- Ultralight aluminum frame with butted hydroformed tubes has a long wheelbase, sporty geometry and slack steering angle; a long wheelbase and low center of gravity aid balance
- Bend in the top tube makes it easy to dismount quickly; cable port on the seat tube allows for the addition of an internally routed dropper seatpost (not included)
- High-quality suspension fork provides comfort on the bumpiest terrain; fork can be adjusted to the rider's weight
- With adjustable compression and rebound damping, the fork can be tuned for the terrain and the day's conditions; lockout function is a bonus on climbs or flat roads
- Precise and easy-to-operate SRAM X5 gear system has 9 gears suitable for a wide range of gradients thanks to 28 teeth in the front and an 11–34-tooth cassette in the back
- Easy-to-use SRAM trigger shifter allows riders to shift smoothly and reliably through the gears using their thumb and index finger
- Hydraulic disc brakes improve control on rough terrain and in wet conditions with their excellent modulation and ergonomic brake levers designed for kids' hands
- Quick-release seatpost clamp allows the streamlined, MTB-specific saddle to be easily adjusted while remaining secure
- Ergonomic contact points are made specifically for kids to provide a more comfortable ride
- Saddle is designed to accommodate their anatomy and biomechanics; tapered handlebar ends and grips are ergonomically designed for kids' hands and with off-roading in mind
- Extra rubber on the palm-facing portion of the grips adds comfort; 100% silicone grips provide maximum hand grip
- Pedals are durable and reflective; they feature slip-resistant pins for extra traction
- Thanks to its flip-flop design, the stem can be turned over and mounted upside down to adjust the handlebar height, helping assure the perfect hand position and fit
- High-quality Schwalbe mountain bike tires with ADDIX Speed rubber compound offer a combo of low rolling resistance, high grip, good shock absorption and excellent durability
- OFF rims and Schwalbe tires are compatible to be set up as a tubeless system
- woom-specific molded chainstay protector
- Thru axle provides maximum torsional strength
- NOTE: Specs and images are subject to change based on component availability
Imported.
- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
New bikes go through a normal break-in period, after which they should be readjusted. All bicycles sold at REI include free adjustments for one year after purchase date—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation and chain lubrication. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
| Best Use | Mountain Biking |
|---|---|
| Frame | AA 6061 aluminum |
| Mountain Bike Style | Cross-country |
| Bike Suspension | Front Suspension |
| Fork | F1RST hydraulic air suspension fork with adjustable compression and rebound damping, plus lockout; 1 to 1-1/8 in. tapered steerer tube ; 100 x 15 mm thru axle; post mount for disc brake |
| Fork Travel | 60 millimeters |
| Crankset | Lightweight, forged aluminum 4.3 in. (110 mm) kid-specific cranks with narrow tread (Q-factor) |
| Bottom Bracket | Thun |
| Shifters | SRAM X5 trigger shifter |
| Rear Derailleur | SRAM X5 rear derailleur |
| Rear Cogs | 9-speed 11-32T cassette |
| Number of Gears | 9 gear(s) |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Promax Hydraulic disc brakes |
| Brake Levers | Ergonomic brake levers designed for childrens' hands |
| Rims | Tubeless-compatible Alex rims wheelset |
| Front Hub | Front hub for disc brake; 14 gauge, 20h, 100 x 15 mm; 2x bearings without quick release |
| Rear Hub | Rear hub for disc brake; 14 gauge, 20h, 135 x 12 mm; alloy cassette body, 4x sealed bearings without quick release |
| Wheel Size | 20 inches |
| Tires | Schwalbe Rocket Ron 20 x 2.25 in. |
| Tire Width | 2.25 inches |
| Handlebar Shape | Riser Bar |
| Handlebar | Sandblasted and silver anodized aluminum; wide, lightweight and ergonomically adapted for more control; tapered ends to fit kids' hands; width: 570 mm; rise: 20 mm |
| Stem | Forged aluminum; 50 mm; +/-15 deg |
| Seat Post | Anodized aluminum; 27.2 x 250 mm; insertion marks indicate the minimum insertion depth; quick-release seatpost clamp |
| Saddle | Ergonomically designed to fit kids' pelvis; nontoxic; side protection to lean against walls |
| Pedals | Flat pedals; 2 x 6 pins; chromoly axle |
| Headset | Fully integrated 1 to 1-1/8 in. headset; sealed industrial bearings |
| Chain | X9 NPGY; 1/2 in. x 11/128 in. (90L) |
| Weight | 21 pounds |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Kids' |