woom OFF 4 Kids’ Mountain Bike

Features

• 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)
• Specs and images are subject to change

Imported.

This bike comes with Coast to Coast Support, which includes:

• 1 year of free adjustments (see more below)
• In-store bike assembly
• Pickup in store or curbside
• Bike experts available at 170+ bike shops

REI Co-op Members get more:

• Free flat tire repairs (labor only; parts not included)
• 20% off shop services

More about our free adjustments: 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.View all woom Kids’ Mountain Bikes

Technical Specs

Best Use

Frame

Mountain Bike Style

Bike Suspension

Fork

Crankset

Bottom Bracket

Shifters

Rear Derailleur

Rear Cogs

Number of Gears

Brake Type

Brakes

Brake Levers

Rims

Front Hub

Rear Hub

Wheel Size

Tires

Tire Width

Handlebar Shape

Handlebar

Stem

Seat Post

Saddle

Pedals

Headset

Chain

Weight

Bike Weight

Gender

Mountain Biking

6061 T6 aluminum with butted and hydroformed tubes

Cross-country

No Suspension

Light carbon fork; 1 to 1-1/8 in. tapered steerer tube; 100 x 15 mm thru axle; post mount for disc brake

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

Thun

SRAM X5 trigger shifter

SRAM X5 rear derailleur

Sunrace 9-speed 11-32T

9 gear(s)

Hydraulic Disc Brake

Promax Hydraulic disc brakes

Ergonomic brake levers designed for childrens’ hands

Tubeless-compatible Alexrims wheelset

Front hub for disc brake, 20h, 14 gauge, 100 x 15 mm, 2x bearings without quick release

Rear hub for disc brake, 20h, 14 gauge, 135 x 12 mm, alloy cassette body, 4x sealed bearings; without quick release

20 inches

Schwalbe Rocket Ron with ADDIX SPEED rubber compound 20 x 2.25 in.

2.25 inches

Riser Bar

Aluminum; sandblasted; silver anodized; width: 570 mm rise: 20 mm

Forged aluminum; CNC-machined; rise/drop: +/-15 deg. with flip-flop design to adjust the handlebar height; length: 50 mm

Anodized aluminum; 27.2 x 250 mm; insertion marks indicate the minimum insertion depth; quick-release seatpost clamp

Mountain-bike specific saddle with side protection

Fiber-reinforced nylon; flat; 2 x 6 pins; chromoly axle

Fully integrated 1 to 1-1/8 in. headset; sealed industrial bearings

KMC X9 NPGY 1/2 in. x 11/128 in.

18 lbs. 8 oz.

Bike weight is based on median size, as sold, or the average of two median sizes.

Kids’

Size Chart

20 INHeight Range

Effective Top Tube

Head Tube Angle (degrees)

Seat Tube Angle (degrees)

Wheelbase

46 – 51

18.1

68

70

33.5

Sizing Notes

All measurements are stated in inches unless otherwise indicated.

How we measure bikes

bike diagram loading

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.