Diamondback El Oso Nino 20 Kids' Fat-Tire Mountain Bike
This bike is made for kids who want to monster-truck over everything in their path. The kids' Diamondback El Oso Nino fat bike fits riders 44–54 in. tall, aged approximately 4–9 years old.
- 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:View all Diamondback Kids' Mountain Bikes
- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- Free flat tire repairs (labor only; parts not included)
- 20% off shop services
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.
Mountain Bike Style
Hi-Ten steel rigid
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
Number of Gears
Mechanical Disc Brake
Apex mechanical disc, with 160 mm front and 160 mm rear rotor
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
Chaoyang 20 x 4.0
Alloy, 560 mm wide, 22.2 mm bar bore
Promax 90 mm
Steel 27.2 mm
Padded Jr. Diamondback
9/16 in. resin platform
KMC 7 Speed
Bike weight is based on median size, as sold, or the average of two median sizes.
20 IN Height Range 3'8'' - 4'7'' Reach 345 Stack 445 Effective Top Tube 508 Seat Tube Center-Top 254 Standover Height 576 Head Tube Length 115 Head Tube Angle (degrees) 71 Seat Tube Angle (degrees) 70 Bottom Bracket Height 240 Wheelbase 927 Chainstay 380 Fork Offset 45
Measurements are stated in millimeters 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.
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