woom  UP 6 Kids' Electric Mountain Bike

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$1,999.00
Members get an est. $199.90 in rewards

Whether tackling gravel, commuting to school, shredding trails or reaching peaks, the woom UP 6 kids' electric mountain bike expands their range with dynamic pedal assist and a kid-specific design.

Color: Electric Blue
Size: 26 IN
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Heads up! Bikes usually take 1-2 additional days to assemble but can take longer during busy periods. We'll email you when yours is ready.

Members get an estimated $199.90 (10%) back on this item as a part of your annual .

Members get an estimated $199.90 (10%) back on this item.
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Key Details

Motor
Fazua drive system
Battery Capacity (Wh)
250 watt hours
Weight
37 pounds

Features

  • 26 in. electric mountain bike designed for children aged 10 years and older
  • Created with kids in mind with a kid-specific geometry and enhanced safety features; at 15.5 mph, motor-assist automatically switches off so they use their own pedal power
  • Delivering a smooth and resistance-free ride, the updated Fazua drive system offers 3 different levels of pedal assist, as well as the option to ride without pedal assist
  • Combined motor and battery unit is compact, lightweight and subtly integrated into the down tube; the battery can easily be removed to charge
  • Compared to its predecessor, the increased motor efficiency of the updated drive pack provides more power without compromising the battery range
  • Cadence and torque sensors are built into the motor, providing a smooth, natural-feeling ride while enabling your rider to go farther
  • High-quality suspension fork can be dialed into the rider's specific weight for comfort on the bumpiest terrain
  • With adjustable compression and rebound damping, the fork can be tuned for the terrain and the day's conditions; its lockout function is a bonus on climbs and flats
  • SRAM NX drivetrain has 11 gears and a wide gear ratio for tackling diverse terrain; coupled with the e-motor, it's ready to thrive whatever the gradient
  • Smooth trigger shifting, courtesy of a precise and easy-to-operate gear system
  • With excellent modulation and special levers designed for kids' hands, the hydraulic disc brakes increase safety and control on rough terrain and in wet conditions
  • Flip-flop design allows the stem to be mounted upside down to adjust the handlebar height, ensuring the perfect hand position and fit
  • Quick-release seatpost clamp allows the saddle to be adjusted with ease while remaining secure
  • Ergonomic contact points are made specifically for kids because comfort is important to the riding experience
  • Custom-size saddle is designed to accommodate their biomechanics; tapered handlebar ends and custom grips are ergonomically designed for small hands, with off-roading in mind
  • Pedals are durable, reflective and feature slip-resistant pins for extra traction
  • Ultralight aluminum frame with butted hydroformed tubes has a long wheelbase, sporty geometry and slack steering angle
  • The bend in the top tube makes it easy to dismount quickly in any situation; cable port on the seat tube allows for the addition of an internally routed dropper seatpost
  • High-quality Schwalbe mountain bike tires offer an ideal combination of low rolling resistance, maximum grip, ample shock absorption and excellent durability
  • Together, the rims and Schwalbe tires are tubeless compatible
  • NOTE: Specs and images are subject to change based on component availability

Imported.

This e-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:
  • An additional year of free adjustments on e-bikes
  • 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)
More about our free adjustments:
New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.

UL2849 certified
View all woom Kids' Bikes

Technical Specs

Best Use

Mountain Biking

Motor

Fazua drive system

Motor Type

Mid-Drive

Motor Torque (Nm)

58 Newton meters

Battery Type

Lithium Ion

Battery Capacity (Wh)

250 watt hours

Battery Removable

Yes

Charge Time (hrs)

4-6 hours

Pedal Assist Range

Up to 35 miles

Mountain Bike Style

All-mountain

Frame

Lightweight, high-quality 6061 T6 aluminum with butted and hydroformed tubes

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 brakes

Fork Travel

90 millimeters

Crankset

Lightweight, forged aluminum 5.9 in. (150 mm) kid-specific cranks with narrow tread (Q-factor)

Bottom Bracket

Fazua bottom bracket houses dual-sided torque and cadence sensors for natural-feeling engagement of drive system

Shifters

SRAM NX trigger

Rear Derailleur

SRAM NX

Rear Cogs

11-speed, 11-42T cassette

Number of Gears

11 gear(s)

Brake Type

Hydraulic Disc Brake

Brakes

Promax hydraulic disc brakes

Brake Levers

Ergonomic brake levers designed for kids' 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

26 inches

Tires

Schwalbe Rocket Ron with ADDIX SPEED rubber compound

Tire Width

2.35 inches

Handlebar Shape

Riser Bar

Handlebar

Wide, ergonomically adapted and lightweight aluminum bars for more control; tapered ends to fit kids' hands; sandblasted and silver anodized; 665 mm wide; 20 mm rise

Stem

Forged aluminum and CNC-machined; handlebars attached via 2 clamps; +/-15-deg. rise/drop with flip-flop design to adjust handlebar height; 50 mm long

Seat Post

Anodized aluminum seatpost with quick-release clamp and insertion marks to indicate the minimum insertion depth; 27.2 x 300 mm

Saddle

Ergonomically designed to fit kids' anatomy; streamlined mountain-bike-specific saddle design with side protection to lean against walls

Pedals

Black flat pedals made from fiber-reinforced nylon; 2 x 6 pins; chromoly axle

Headset

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

Chain

KMC X9 NPGY 1/2 in. x11/128 in.

Weight

37 pounds

Bike Weight

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

Gender

Kids'

Size Chart

woom Bikes (233847, 248470)
26 IN
Height Range4'7'' - 5'5''

How we measure bikes

  1. 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.
  2. Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
  3. 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.
  4. 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.
  5. 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.
  6. Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
  7. Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
  8. Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
  9. Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
  10. Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
  11. Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
  12. 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.

Buying Advice

The Ultimate Guide to Buying a Kids' Bike

What size bike does my child need?

  • Measure your child’s height and inseam (the length from their crotch to the floor). Age can provide a rough guide, but since kids grow at different rates, a size/inseam measurement will be more accurate. Compare that measurement to a bike sizing guide to help you find the right wheel size.
  • Buy a bike that fits well now rather than one that is too large that they can "grow into." A properly sized bike will be easier for kids to handle, a lot safer and more fun to ride.

Four bike types

  • Balance bikes are best for teaching balance and steering to the youngest riders.
  • Training wheel bikes are great for kids who want to build confidence while learning to ride.
  • Cruiser bikes have smooth, wide tires and are ideal for riding on paved surfaces.
  • Mountain bikes: Riding on trails and rough off-road terrain.

Features

  • Weight and frame material: Lighter bikes are easier for kids to handle. To save weight, look for bikes with aluminum frames.
  • Wider tires offer more stability, traction and cushion.
  • Brakes: Coaster brakes tend to be easier for younger kids to use and require less maintenance. Handbrakes typically appear on larger kids' pedal bikes and require more hand strength to use.

A child rides a bike with pink tassles
Austin, TX

15 min read: The Ultimate Guide to Buying a Kids' Bike

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