Tern GSD S00 Electric Bike

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Enormously useful, surprisingly small. Despite its mad hauling power, the Tern GSD S00 electric bike is the same length as a regular e-bike and it packs down to fit into even smaller spaces.

  • Features

    • Perfect for many places a standard e-bike doesn't fit—elevators, trains, apartments—this bike packs down to 1/3 its volume in only 10 sec.
    • The GSD is designed to carry 2 kids, a week's worth of groceries or 400 lbs. of cargo
    • Includes Cargo Hold panniers and a frame-integrated rack
    • Andros stem offers handlebar height and reach adjustments
    • Adjusts to fit riders from 4 ft. 8 in. to 6 ft. 4 in., so mom, dad and the kids can all share it
    • Fits 2 Thule Yepp Maxi child seats or 1 Thule Yepp Nexxt Maxi seat with no adapters needed (child seats not included)
    • 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 the Tern GSD Product LineView all Tern Electric Cargo Bikes
  • Technical Specs

    Best Use

    Urban Cycling

    E-Bike Classification

    Class 1: pedal assist up to 20 mph


    Bosch Performance Line CX, 250W

    Motor Type


    Motor Torque (Nm)

    75 Newton meters

    Battery Type

    Lithium Ion

    Battery Capacity (Wh)

    500 watt hours

    Battery Removable


    Charge Time (hrs)

    4.5 hours

    Pedal Assist Range

    32-62 miles


    7005-T6 aluminum

    Bike Suspension

    No Suspension




    Tern GSD custom, forged 6061-AL DH crankarm

    Bottom Bracket

    Motor Integrated


    Enviolo CA, Twist

    Rear Derailleur

    Chain tensioner

    Rear Cogs


    Number of Gears


    Internally Geared


    Brake Type

    Hydraulic Disc Brake


    Magura MT-5, 4 piston, 180mm rotors

    Brake Levers

    Magura hydraulic


    Tern Atlas, ultra-wide 36mm, dual-reinforced joint

    Front Hub

    Tern Atlas, Boost thru-axle, sealed cartridge bearings

    Rear Hub

    Enviolo Cargo Groupset, 380% continuously variable gear range, Boost thru-axle

    Wheel Size

    20 inches


    Schwalbe Super Moto-X, 62-406, Green Guard puncture protection, reflex

    Tire Width

    62 millimeters

    Handlebar Shape

    Moustache Bar


    Tern Sweep, 27 degrees, 6061-Al, Tern Andros adapted


    Tern Andros (G2), adjustable, forged construction, patented technology

    Seat Post

    Tern Telescope, 34.9mm, 2014-Al


    Tern GSD, with rear handle


    Urban with nonslip surface and sealed bearings


    Tern Flux Pro Taper, 1.5 in., angular contact bearings, Physis integrated


    KMC for e-bike, EPT corrosion-resistant coating


    71 lbs. 8 oz.

    Bike Weight

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




    Contains recycled materials

  • Size Chart

    One Size
    Height Range4'11" - 6'5"

    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.
  • Reviews
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