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Diamondback El Oso Nino 20 Complete Fat Bike - 2016


Item # DMB003H

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  • Satin Blue, One Size ($450.00)
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Item # DMB003H

Child of the beast.

Give the sitter a day off and take your tyke outside for a wintertime excursion of active fun with the 2016 Diamondback El Oso Nino 20 Complete Fat Bike. Made to complement your full-sized, fat-tire beast, the El Oso Nino cuts a rugged profile as a perfectly proportioned, teddy bear approved sidekick to tackle the snowpack.

The El Oso Nino's frame is made from high-tensile steel, which is durable enough to weather bike-throwing tantrums and other winter bumps. Despite its strength, the frame remains nimble enough to navigate winding trails like a bear cub in splashing pursuit of elusive salmon. Shimano's one-by 7-speed drivetrain provides a range of gears to match the route's ups and downs, and mechanical disc brakes grant consistent, reliable stopping power.

Diamondback caps off the El Oso Nino with 20in wheels boasting extra-wide rims and Chaoyang tires. Measuring a beefy four inches in width, these plush, knobby platforms absorb bumps effortlessly and float across snow-covered singletrack in conditions that would be difficult to navigate on a road or mountain bike.

Tech Specs

Frame Material:
Hi-Ten steel
Hi-Ten Steel Junior Rigid
Shimano RS-35 Grip Shift
Rear Derailleur:
Shimano Tourney 7 speed
40 t steel
Bottom Bracket:
square taper - 5pc
Crank Arm Length:
152 mm
KMC 7 speed
Brake Type:
mechanical disc
160 mm
alloy 22.2
Ahead 90mm extension
Jr Mtn Padded
steel 27.2mm
Diamondback Jr Fat 20in
[front] steel fat bike loose ball, bolt on, [rear] steel fat bike loose ball, bolt on, freewheel
Tire Size:
20 x 4.0 in
owner's manual
Recommended Use:
snow and sand
Manufacturer Warranty:
lifetime on frame

sizing chart

Bike size by rider height


Geometry chart


Geometry Chart


El Oso Nino 20
120mm Travel Fork

Seat Tube


Effective Top Tube


Stand Over

Head Tube


Head Tube Angle


Seat Tube Angle




One Size 10.7in 20in 22.7in 4.5in 71o 70o 15in

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Unanswered Question

Can you put a smaller tire like the Specialized 20 x 2.8 plus tire on the rim? It looks like it would be much more versatile for summer that way.

Young rider fun...

  • Familiarity: I've used it once or twice and have initial impressions

I bought this for my 6 year old son to get us outside even more during the winter. It's a little too big (longer reach and the crank length is a bit long when the seat is all the way at the bottom). Regardless, he loves me to push him around while he gives it a while and looking forward to him growing into it. The bike is built well, albeit a little heavy. The grip shift may be a little hard for young hands with gloves, but we'll see.