Diamondback El Oso Nino 20 Kids’ Fat-Tire Mountain Bike

Features

• This little bear’s frame and fork are made from high-tensile steel for a smooth ride that’s tough enough for prowling the neighborhood and the woods
• 4 in. wide tires offer amazing grip and sit atop 20 in. inch wheels, making for a unique style and ride
• Low tire pressure allows the bike to grab every bit of traction available, with extra float for soft surfaces and sand
• Apex mechanical disc brakes with 160 mm rotors front and rear provide great stopping power, allowing riders to go wherever the trail or their imagination takes them
• Shimano Tourney 1 x 7 speed drivetrain with Revo Grip Shift has 7 speeds to keep shifting simple and easy to master; Shimano grip shifter lets them charge up hills
• 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 Diamondback Kids’ Mountain Bikes

Technical Specs

Best Use

Mountain Bike Style

Frame

Fork

Bike Suspension

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

Fat-tire

Hi-Ten steel

Hi-Ten steel rigid

No Suspension

152 mm steel arms with 40T Single Ring

Square Taper – 5pc

Shimano Tourney RS35 Grip Shift, 7 Speed

Shimano Tourney FT35, 7-speed

Shimano Tourney TZ21 7-speed Freewheel, 14-28T

7 gear(s)

Mechanical Disc Brake

Apex mechanical disc, with 160 mm front and 160 mm rear rotor

Alloy lever

Jr Fatty Alloy, 32 h

Steel 32 h disc, 3/8 in. nutted, 135 mm OLD

Steel 32 h disc, freewheel, 3/8 in. nutted, 180 mm OLD

20 inches

Chaoyang 20 x 4.0

4.0 inches

Riser Bar

Alloy, 560 mm wide, 22.2 mm bar bore

Promax 90 mm

Steel 27.2 mm

Padded Jr. Diamondback

9/16 in. resin platform

Threadless

KMC 7 Speed

30 pounds

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

Kids’

Size Chart

20 INHeight Range

Reach

Stack

Effective Top Tube

Seat Tube Center-Top

Standover Height

Head Tube Length

Head Tube Angle (degrees)

Seat Tube Angle (degrees)

Bottom Bracket Height

Wheelbase

Chainstay

Fork Offset

3’8” – 4’7”
345
445
508
254
576
115
71
70
240
927
380
45

Sizing Notes

Measurements are stated in millimeters 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.