Happy venturing down a gravel path, up a mountain road or on the MTB trail, the 20 in. woom OFF 4 kids' mountain bike can also hold its own on the pavement and is specifically designed for kids.
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- This bike is stable, responsive and equipped with high-performance components and tubeless-compatible rims and tires
- Ultralight aluminum frame with butted hydroformed tubes has a long wheelbase, sporty geometry and slack steering angle
- Bend in the top tube makes the bike easy to dismount quickly in any situation
- Superlight carbon fork offers maximum stability with minimal weight; multidirectional carbon fibers ensure plenty of torsional strength when steering and braking
- 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 11-32 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 brake levers designed for kids' hands
- Quick-release seatpost clamp allows the saddle to be easily adjusted while remaining secure
- Contact points on the bike are made specifically for kids
- Custom-sized saddle is designed to accommodate the biomechanics of young riders
- Tapered handlebar ends and custom grips are ergonomically designed for kids' small hands, with off-road riding 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, and 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
- Rims and Schwalbe tires are compatible to be set up as a tubeless system
- Long wheelbase and low center of gravity aid in balancing
- woom-specific molded chainstay protector
- Thru axle provides maximum torsional strength
- Lightweight, forged-aluminum, 4.3 in. (110 mm), kid-specific cranks with narrow tread (Q-factor)
- 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 | 6061 T6 aluminum with butted and hydroformed tubes |
| Mountain Bike Style | Cross-country |
| Bike Suspension | No Suspension |
| Fork | Light carbon fork; 1 to 1-1/8 in. tapered steerer tube; 100 x 15 mm thru axle; post mount for disc brake |
| Crankset | Lightweight, forged aluminum, 4.3 in. (110 mm), kid-specific cranks with narrow tread (Q-factor); narrow-wide chainring with 28 teeth in the front |
| Bottom Bracket | Thun |
| Shifters | SRAM X5 trigger shifter |
| Rear Derailleur | SRAM X5 rear derailleur |
| Rear Cogs | Sunrace 9-speed 11-32T |
| 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 Alexrims wheelset |
| Front Hub | Front hub for disc brake, 20h, 14 gauge, 100 x 15 mm, 2x bearings without quick release |
| Rear Hub | Rear hub for disc brake, 20h, 14 gauge, 135 x 12 mm, alloy cassette body, 4x sealed bearings; without quick release |
| Wheel Size | 20 inches |
| Tires | Schwalbe Rocket Ron with ADDIX SPEED rubber compound 20 x 2.25 in. |
| Tire Width | 2.25 inches |
| Handlebar Shape | Riser Bar |
| Handlebar | Aluminum; sandblasted; silver anodized; width: 570 mm rise: 20 mm |
| Stem | Forged aluminum; CNC-machined; rise/drop: +/-15 deg. with flip-flop design to adjust the handlebar height; length: 50 mm |
| Seat Post | Anodized aluminum; 27.2 x 250 mm; insertion marks indicate the minimum insertion depth; quick-release seatpost clamp |
| Saddle | Mountain-bike specific saddle with side protection |
| Pedals | Fiber-reinforced nylon; flat; 2 x 6 pins; chromoly axle |
| Headset | Fully integrated 1 to 1-1/8 in. headset; sealed industrial bearings |
| Chain | KMC X9 NPGY 1/2 in. x 11/128 in. |
| Weight | 18 lbs. 8 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Kids' |
| 20 IN | |
|---|---|
| Height Range | 46 - 51 |
| Effective Top Tube | 18.1 |
| Head Tube Angle (degrees) | 68 |
| Seat Tube Angle (degrees) | 70 |
| Wheelbase | 33.5 |
Sizing Notes
All measurements are stated in inches unless otherwise indicated.
How we measure bikes
- Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
- Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
- Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.