DiamondBack El Oso Grande '16

$1,700.00 $1,449.99
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El Oso Grande

El Oso Grande fat bike is, like its namesake, surprisingly quick and nimble for its size. This big bear may look like a lumbering beast, but after a few pedal strokes it’s apparent that the bike is a trail-capable adventure machine. We designed El Oso Grande around a rigid platform to shave pounds and let the gigantic tires take care of the suspension—something they do quite well. With hydroformed aluminum tubes, the frame and fork allow an amazingly nimble ride. A SRAM X5 2×10 drivetrain has a gear for any trail, and disc brakes provide excellent modulation and stopping power. And how could we forget about the tires: they’re five inches wide. Able to be comfortably ridden with PSI in the low teens, El Oso Grande digs its claws in and doesn’t let go. Whether you’re bikepacking, riding in deep sand and snow, or just enjoying the excess traction on normal trails, this bike is prepared!


  • 6061-T6 aluminum frame/fork with hydroformed tubes, 1.5" tapered machined headtube, fits up to 26x5" tire
  • SRAM X5 10speed rear derailleur and FSA double chainring crank give you 20 speeds to choose from
  • Powerful disc brakes help you stop well in varied conditions
  • DB El Oso Custom rigid fork with 15mm thru-axle
  • 26x 4.9" tires are wide enough to keep you going where other bikes give up
  • Size Guide
    Convert mm to inches
    Seat Tube Length **400.0mm457.0mm500.0mm
    Standover Height787.0mm804.0mm820.0mm
    Top Tube Length *580.0mm609.0mm630.0mm
    Head Tube Length110.0mm120.0mm120.0mm
    Head Angle68.5°68.5°68.5°
    Seat Angle74.0°74.0°74.0°
    Chain Stay Length460.0mm460.0mm460.0mm
    Fork Offset50.0mm50.0mm50.0mm
    BB Drop60.0mm60.0mm60.0mm
    Stem Length0.0mm0.0mm0.0mm
    Handlebar Width0.0mm0.0mm0.0mm
    Crank Length0.0mm0.0mm0.0mm
    Seat Post Length0.0mm0.0mm0.0mm
    * Measured Horizontally** Measured from Center
  • Specs
    SizesS/16"  M/18"  L/20" 
    FrameEl Oso Butted 6061-T6 Aluminum w/ Formed Top / Down Tube, 1.5" Tapered Machined Headtube, 197mm Thru Axle, Fits up to 26x5" tire
    ForkDB El Oso Custom Rigid Alloy Fork, 1.5 Taper, 150mmx15mm Thru
    HeadsetFSA C-40 Sealed 1-1/8"/1.5" ACB Integrated
    CranksFSA Comet Mega Exo, 36/26T
    Bottom BracketFSA Mega Exo
    F. DerailleurSRAM X5 High Direct Mount
    R. DerailleurSRAM X5
    ShifterSRAM X5 10spd
    CogsetShimano HG50 10spd (11-36t)
    ChainKMC X10 EPT Anti-Rust
    BrakesTRP Spyre Mechanical Disc, 160mm/160mm Rotor
    Brake LeversTRP ML800 Spyke
    Front HubAlloy 32h Sealed Cartridge Bearing 150mmx15mm Thru
    Rear HubAlloy 32h Cassette, Sealed Cartridge Bearing 197mmx12mm Thru
    Spokes14g Stainless Steel
    RimsDB 95wide w/55mm Cutout, Singlewall 32h
    TiresChaoyang Cruiser 26"x4.9"
    HandlebarDB Pro Bar740mm width, 15mm rise, 31.8mm barbore
    GripsDB High Density Foam Grip
    StemDB 3D Forged, +/-7° Rise 31.8
    SeatpostDB Micro Adjust 30.9mm
    SeatDB Race M-series saddle w/ cromo rails
    ExtrasOwner’s Manual, Chainstay Protector, Clear Coat, H20 bottle mounts
    NoteSpecifications Subject to Change