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2020 Diamondback

el Oso Uno

A 26″ steel frame rigid fat bike with mid-range components and tektro mechanical disc brakes.
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Manufacturer Price

$850
FrameSteel
SuspensionRigid
ForkSteel
Wheels26″ Aluminum
Drivetrain2 × 9
GroupsetAlivio, Acera
BrakesTektro Mechanical Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
el Oso Uno
Other Fat bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

41 km/h

el Oso Uno

36 km/h

Similar Bikes

Highest gear

(descending)

Sizing
SM

158cm – 170cm

MD

168cm – 179cm

LG

176cm – 187cm

🐐 Estimated

Rider Fit Notes

None yet.

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Reviews
Bicycling
The Diamondback El Oso Is an Affordable and Rad Fat Bike

Feb 2018

Want to steamroll over terrain regular bikes can't conquer? This line of fat bikes is a great bargain—and there's even a mini-version for your sidekick.

Highs
  • Lightweight aluminum frame

  • Quality parts for the price

  • Versatile for sand, snow, and trail surfaces

  • Hydraulic disc brakes on upper-end model

  • Up to 5-inch tire clearance

  • Bikepacking-friendly with rack mounts and wide triangle

Lows
  • It's a bit of a tank even without bags

  • Lower-end models have rigid fork and mechanical brakes

Read Review

Geometry
Specs
Build
Frame

El Oso Butted Heat Treated Steel, 1-1/8" Headtube, 170mm Rear OLD, w/Laser Cut Disc Drop Outs, Fits up to 26x5" tire

Fork

DB El Oso Custom Rigid Steel Fork, 1-1/8" Steerer Tube, 135mm QR Disc Dropouts

Bottom Bracket

Sealed Cartridge

Headset

FSA Orbit, No.8B

Stem

DB 3D Forged, 7° Rise, 31.8 Bar Bore

Handlebar

Diamondback, 740mm Wide, 15mm Rise, 31.8 Bar Bore

Saddle

DB Race M-series Saddle

Seatpost

DB Alloy Micro Adjust, 30.9mm

TypeRigid

Pedals

DB4L Alloy Platform

Grips

DB High Density Foam Grip

Groupset
Rear Derailleur

Shimano Acera M3000, Shadow, 9 Speed, SGS

Front Derailleur

Shimano Alivio M4020-D, Side Swing, Front Pull, Direct Mount

Crank

SR Suntour XCM, 36/22T

Shifters

Shimano Acera M3000, 2x9 Speed Rapidfire

Cassette

Shimano HG200, 9 Speed, 11-36T

Chain

KMC X9 EPT Anti-Rust

Brakes

Tektro Aires Mechanical Disc, w/180mm Front / 160mm Rear Rotors

TypeTektro Mechanical Disc

Brake Levers

Tektro 2 Finger Alloy

Wheels
Rims

Diamondback 73mm Wide w/28mm Cutouts, 32h Alloy Singlewall

Spokes

14g Stainless Steel

Front Hub

32h Alloy, 3/8" Nutted

Rear Hub

32h Alloy, 3/8" Nutted, Cassette

Tires

Chaoyang Cruiser 26x4.0"

Rider Notes
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First added 2 April

Last updated 28 July

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