Diamondback Response Electric Bike

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Members get an estimated $410.00 back on this item.
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Sure, you can take the usual route, but why not mix things up a bit? Duck down the alley, zip across the park and enjoy the journey with the Diamondback Response electric bike.

  • Features

    • Bosch Performance Line Speed motor with 85 Nm of torque and a 10-speed Shimano Deore M6000 drivetrain provide the assistance and gears to get you to any destination
    • Magura hydraulic disc brakes provide confident stopping power
    • 2.8 in. Schwalbe Super Moto-X tires mounted on tubeless-compatible 27.5 in. wheels provide loads of traction on smooth or gritty pavement
    • 120 mm-travel RockShox Judy Gold fork makes easy work of obstacles both natural and manmade
    • Hydroformed aluminum frame with new nested battery compartment provides a clean look
    • Specs and images are subject to change


    This e-bike comes with Coast to Coast Support, which includes:
    • 1 year of free adjustments (see more below)
    • In-store bike assembly
    • Pickup in store or curbside
    • Bike experts available at 170+ bike shops
    REI Co-op Members get more:
    • An additional year of free adjustments (2 total years; see below)
    • Free flat tire repairs (labor only; parts not included)
    • 20% off shop services
    More about our free adjustments:
    New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. 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 Electric City Bikes
  • Technical Specs

    Best Use

    Recreational Cycling

    E-Bike Classification

    Class 3: pedal assist up to 28 mph


    Bosch Performance Line Speed; 85 Nm torque

    Motor Type


    Motor Torque (Nm)

    85 Newton meters

    Battery Type

    Lithium Ion

    Battery Capacity (Wh)

    500 watt hours

    Battery Removable


    Charge Time (hrs)

    3 hours

    Pedal Assist Range

    35-65 miles

    Bike Frame Material



    6061-T6, Trail Speed geometry, Powertube integrated battery

    Bike Suspension

    Front Suspension


    Rock Shox Judy Gold 120 mm Travel, 27.5+

    Fork Travel

    120 millimeters


    FSA Forged Aluminum, 170 mm, annodized black

    Bottom Bracket

    Bosch Performance Line Speed


    Shimano Deore M6000, 10-speed

    Rear Derailleur

    Shimano Deore M6000, GS, Shadow Plus

    Rear Cogs

    Shimano HG500, 11-42T, 10-speed

    Number of Gears

    10 gear(s)

    Brake Type

    Hydraulic Disc Brake


    Magura Fifty4, 4-piston front 203 mm rotor, 2-piston rear 180 mm rotor

    Brake Levers

    Magura, HC Carbon levers


    27.5 in., thru axle, 45 mm ID, disc-specific, tubeless compatible

    Front Hub

    Formula, sealed bearing, thru axle, Boost 110, 32h

    Rear Hub

    Formula, sealed bearing, thru axle, Boost 148, 32h

    Wheel Size

    27.5+ inches


    27.5 x 2.8 in. Schwalbe Super Moto-X, RaceGuard

    Tire Width

    2.8 inches

    Handlebar Shape

    Flat Bar


    Flat Bar, 6061 aluminum


    Aluminum alloy 3D forged, +/-7 degree

    Seat Post

    Aluminum alloy forged head


    Custom Ergo Performance


    Aluminum cage with sealed bearings and chromoly axles


    Semi-cartridge integrated bearing


    KMC x10 ePT e-bike specific





  • Size Chart

    S M L
    Height Range 5'4" - 5'7" 5'7" - 5'10" 5'10" - 6'1"
    Reach 400 413 431
    Stack 645 645 650
    Effective Top Tube 585 598 617
    Seat Tube Center-Top 410 460 510
    Standover Height 774 791 809
    Head Tube Length 145 145 150
    Head Tube Angle (degrees) 68 68 68
    Seat Tube Angle (degrees) 74 74 74
    Bottom Bracket Height 311 311 311
    Wheelbase 1,159 1,173 1,193
    Chainstay 470 470 470
    Fork Offset 51 51 51

    Sizing Notes

    Measurements are stated in millimeters unless otherwise indicated.

    How we measure bikes

    1. Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
    2. Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
    3. Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
    4. Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
    5. Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
    6. Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
    7. Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
    8. Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
    9. Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
    10. Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
    11. Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
    12. Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
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