Who wouldn't love the rugged looks and monster tires on this fat bike? The Diamondback El Oso Nino is made for kids who want to monster truck over everything in their path.
Wheel Size
20 inches
Number of Gears
7 gear(s)
- The frame and fork of this "little bear" are made from high-tensile steel that's tough enough for life around the neighborhood and in the woods
- 7-speed Shimano drivetrain is controlled with grip shifters to charge up hills; powerful disc brakes allow controlled descents and stopping
- 4-in.-wide tires sit atop 20 in. wheels; low tire pressure allows the bike to grab every bit of traction available, with extra float for soft surfaces and sand
- NOTE: Specs and images are subject to change based on component availability
Imported.
This bike comes with Coast to Coast Support, which includes:
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- 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 | Hi-Ten steel |
| Fork | Hi-Ten steel |
| Crankset | Steel, 40t |
| Bottom Bracket | Square taper |
| Shifters | Shimano RS-35 Grip Shift |
| Rear Derailleur | Shimano Tourney |
| Rear Cogs | Shimano freewheel, 7-speed |
| Number of Gears | 7 gear(s) |
| Brake Type | Mechanical Disc Brake |
| Brakes | Mechanical disc |
| Brake Levers | Alloy |
| Rims | Diamondback Jr Fat |
| Front Hub | Steel loose ball |
| Rear Hub | Steel loose ball |
| Wheel Size | 20 inches |
| Tires | Chaoyang, 20 x 4 |
| Tire Width | 4.0 inches |
| Handlebar Shape | Riser Bar |
| Handlebar | Alloy |
| Stem | Ahead |
| Seat Post | Steel |
| Saddle | Jr Mountain |
| Pedals | Resin platform |
| Headset | Threadless |
| Chain | KMC |
| Weight | 35 lbs. 8 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Boys' Girls' |
Diamondback Bikes (100420)
| 20 in | |
|---|---|
| Height Range | 47" to 56" |
| Reach | 346 |
| Stack | 446 |
| Effective Top Tube | 508 |
| Seat Tube Center-Top | 272 |
| Standover Height | 576 |
| Head Tube Length | 115 |
| Head Tube Angle (degrees) | 71 |
| Seat Tube Angle (degrees) | 70 |
| Bottom Bracket Height | 290 |
| Wheelbase | 927 |
| Chainstay | 380 |
| Fork Offset | 45 |
Sizing Notes
Bike measurements are stated in millimeters.
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.