woom OFF AIR 4 Kids' Mountain Bike
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.
Key Details
- 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' |
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Great first mountain bike
Single pregnant mom managed to put the bike together easily. Ok, so I put the handle bars on upside down the first time but that's because I wasn't reading any instructions. I was happy with the assembly process. My son loved the bike. We tried it out in the neighborhood and at the local greenbelt space with hills. The bike had no problems on the street and was a blast in the off-road hills. This was my son's first mountain bike and he felt comfortable going up and down the hills on this bike. He even started to play with the suspension and shift his weight out of the saddle. The hand brakes were easy to grip and work. The shifters had no issues either for his smaller hands. I'd definitely recommend this bike and brand.
Hands down the best mountain bike for kids
I'm a massive convert. In one day, this bike took my kid from a comfortable road rider to a highly confident mountain biker. Truly a game-changer for our little biker. Context: 6yo kid rides on roads daily, but has generally been a reluctant mountain biker. She previously rode another brand of mountain bike and it was fine, but rides often ended with whining or frequent stops. The Woom Off Air is better in all respects. We rode a ~5-mile rocky fire road on a winter day and she crushed it. This bike is ridiculously lightweight, has great components, and (like all Woom bikes) was thoughtfully designed with little riders in mind. It's easy for her to start on a rocky hill and shift with ease. The bike arrived well-packaged and padded and assembly was straight forward. Prior to using this bike, I thought front suspension for a 45lb kid was silly, but it makes a huge difference. She almost floated over these massive rocks on the trail. I originally bought her a different mountain bike because this one felt like overkill but gosh was I wrong. In literally one ride she was a different biker altogether. From my 6yo: "I love my new bike because it's golden (!!) and it has suspension so I don't have to stop or look down when I crash into a rock, I can just keep going!" From the mouths of babes folks. Really, if your kid is interested in mountain biking, you can't go wrong with this bike.Â
12/10 would highly recommend
You will definitely get your bang for your buck with this bike. My kids absolutely love the feel of this beauty on dirt and on any bumps. Perfect size for my 6 year old (almost 7 yo) and even works for my 4 yo when you drop the seat post all the way down.