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A ride that doesn't bob when you stomp the pedals, yet offers smooth suspension for rolling over roots and rocks—sound to good to be true? Think again with the Diamondback Release 1 27.5 bike.

  • Features

    • Tough, yet lightweight aluminum frame isolates chain forces from trail inputs
    • Shimano Deore 1x10 drivetrain offers ample gears to tackle a variety of terrain
    • SR Suntour Aion fork and X-Fusion 02 Pro R rear shock provide a smooth, flowing ride
    • Level Link design eats up bumps with 130mm supple rear suspension
    • Boost 148 x 12mm "maxle" thru-axle and Boost 110 fork add stiffness
    • Shimano hydraulic disc brakes bring the bike to a tidy stop
    • Tubeless-ready Diamondback Blanchard wheels
    • Specs and images 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 Full-Suspension Mountain Bikes
  • Technical Specs

    Best Use

    Mountain Biking

    Mountain Bike Style


    Bike Frame Material




    Bike Suspension

    Full Suspension


    SR Suntour Aion, 27.5", 150mm travel, air-spring with rebound adjust, 35mm stanchions, 1.5" alloy taper steerer, with Boost 110x15mm thru-axle

    Fork Travel

    150 millimeters

    Rear Shock

    X-Fusion 02 Pro R large volume with rebound adjust, 200 x 57mm


    FSA Comet direct mount 1x, with 30T steel chainring

    Bottom Bracket

    FSA sealed outboard


    Shimano Deore M6000, 10-speed

    Rear Derailleur

    Shimano Deore M6000 Shadow Plus, 10-speed

    Rear Cogs

    Shimano HG500 cassette, 10-speed, 11-42T

    Number of Gears

    10 gear(s)

    Brake Type

    Hydraulic Disc Brake


    Shimano BR-M395 hydraulic disc, with 180mm rotors

    Brake Levers

    Shimano BL-M425


    Diamondback Blanchard 28R, tubeless compatible, 32h

    Front Hub

    32h Alloy, Boost 110 x 15mm thru-axle, sealed cartridge bearing

    Rear Hub

    32h Alloy, Boost 148 x 12mm thru-axle, 4 sealed cartridge bearing, cassette

    Wheel Size

    27.5 inches


    WTB Vigilante, 27.5 x 2.3"

    Tire Width

    2.3 inches

    Handlebar Shape

    Riser Bar


    DB35 alloy, 780mm wide, 15mm rise, 35mm bar bore


    DB35 alloy, 40mm reach, 35mm bar bore

    Seat Post

    DB alloy micro adjust, 31.6mm


    WTB Volt Comp


    DB4L alloy platform with replaceable pins


    FSA No. 57 sealed cartridge


    KMC X10EL, 10-speed


    32 lbs. 1.6 oz.

    Bike Weight

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



  • Size Chart

    S M L XL
    Height Range 5' 4" - 5' 7" 5' 7" - 5' 10" 5' 10" - 6' 2" 6' 2" - 6' 6"
    Reach 406.3 428.5 450.7 473.3
    Stack 584.4 593.6 602.7 611.8
    Effective Top Tube 585 610 635 660
    Seat Tube Center-Top 394 432 483 533
    Standover Height 739 740 743 749
    Head Tube Length 100 110 120 130
    Head Tube Angle (degrees) 66 66 66 66
    Seat Tube Angle (degrees) 73 73 73 73
    Wheelbase 1133 1160 1186 1213
    Chainstay 425 425 425 425
    Fork Offset 44 44 44 44

    Sizing Notes

    Measurements are stated in millimeters unless otherwise indicated.

  • Reviews
    4 reviews with an average rating of 4.8 out of 5 stars

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