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Diamondback designed the El Oso Grande around a rigid platform to shave pounds and let the gigantic tires take care of the suspension, floating over sand, snow, or crazy-loose trails.

  • Features

    • With hydroformed aluminum tubes, the frame and fork allow an amazingly nimble ride
    • SRAM X5 2x10 drivetrain has a gear for any trail, and mechanical disc brakes provide excellent modulation and stopping power
    • 26 x 4.9 in. tires can be comfortably ridden with PSI in the low teens
    • Specs are subject to change


    Free Adjustment Period:
    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 Rigid Mountain Bikes
  • Technical Specs

    Best Use

    Mountain Biking

    Mountain Bike Style


    Bike Frame Material



    6061 aluminum



    Bike Suspension

    No Suspension


    FSA Comet Mega Exo, 36/26

    Bottom Bracket

    FSA Mega Exo


    SRAM X5

    Front Derailleur

    SRAM X5

    Rear Derailleur

    SRAM X5

    Rear Cogs

    Shimano HG50, 11-36, 10-speed

    Number of Gears

    20 gear(s)

    Brake Type

    Mechanical Disc Brake


    TRP Spyke mechanical disc

    Brake Levers

    TRP ML800 Spyke



    Front Hub

    Alloy disc, 32h

    Rear Hub

    Alloy disc, 32h

    Wheel Size

    26 inches


    Chaoyang Cruiser, 26 x 4.9

    Handlebar Shape

    Riser Bar


    DB Pro Bar


    DB 3D forged

    Seat Post

    DB micro adjust


    DB Race M-series


    DB alloy platform


    FSA C-40


    KMC X10


    34 lbs. 13 oz. pounds

    Bike Weight

    Bike weight is based on median size, as sold, or the average of two median sizes.



  • Size Chart

    S M L
    Height Range 5’5”-5’9” 5’10”-6’0” 6’1-6’4”
    Reach 408 434 455
    Stack 600 609 609
    Effective Top Tube 580 609 630
    Seat Tube Center-Top 400 457 500
    Standover Height 787 804 820
    Head Tube Length 110 120 120
    Head Tube Angle (degrees) 68.5 68.5 68.5
    Seat Tube Angle (degrees) 74 74 74
    Bottom Bracket Height 342 342 342
    Wheelbase 1125 1155 1176
    Chainstay 460 460 460
    Fork Offset 50 50 50

    Sizing Notes

    Bike measurements are stated in millimeters.

  • Reviews
    3 reviews with an average rating of 4.7 out of 5 stars

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  • Questions & Answers

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