Tern Vektron D8 Folding Electric Bike

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The Tern Vektron D8 folding electric bike delivers performance and versatility all in one. With hydraulic disc brakes, fenders and a rack, you'll be crushing your commute come rain, snow or shine.

  • Features

    • Bafang M400 Drive System offers 250 watts of responsive and dependable power
    • Maximum torque of 80 Nm provides fast acceleration
    • Resizes in seconds to fit riders from 5 ft. 3 in. to 6 ft. 5 in. in height (160-195cm)
    • 400 watt-hour battery offers a range of up to 56 mi. (90km)
    • Hydraulic disc brakes are good for all-weather stopping power
    • Tern Valo Direct light, with 150 lumens of power, improves your visibility in low light
    • Shimano Claris rear derailleur provides quick and responsive gear shifting
    • 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 Vektron Product LineView all Tern Electric Folding Bikes
  • Technical Specs

    Best Use

    Urban Cycling

    E-Bike Classification

    Class 1: pedal assist up to 20 mph


    Bafang M400 Drive System, 36 V/250 W

    Motor Type


    Motor Torque (Nm)

    80 Newton meters

    Battery Type

    Lithium Ion

    Battery Capacity (Wh)

    400 watt hours

    Battery Removable


    Charge Time (hrs)

    5 hours

    Pedal Assist Range

    25-56 miles


    Tern Vektron, hydroformed aluminum, OCL+ joint, 3 patented technologies



    Bike Suspension

    No Suspension


    Integrated, high-tensile steel


    Vektron custom, forged AL6061 crankarm

    Bottom Bracket

    Motor Integrated


    Shimano, 1 x 8-speed, trigger

    Rear Derailleur

    Shimano Claris

    Rear Cogs

    Shimano 11-32T, 8-speed

    Number of Gears

    8 gear(s)

    Brake Type

    Hydraulic Disc Brake


    Shimano hydraulic disc

    Brake Levers

    Shimano hydraulic disc


    Kinetix Comp for disc

    Front Hub

    Shimano disc

    Rear Hub

    Shimano disc

    Wheel Size

    20 inches


    Schwalbe Big Apple, Active Line, 50-406, puncture protection, Reflex

    Tire Width

    50 millimeters

    Handlebar Shape

    Flat Bar


    Flat bar, 6061-Al, Tern Andros adapted


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

    Seat Post

    SuperOversize, 6061-Al, micro-adjust clamp


    Tern Porter, patented GripPad design


    Folding, alloy body


    Tern Flux, cartridge bearings, Physis integrated


    8-speed, DHT for e-bike, GST corrosion-resistant coating


    49 lbs. 9.6 oz.

    Bike Weight

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




    Contains recycled materials

  • Reviews
    7 reviews with an average rating of 4.9 out of 5 stars

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