Tern Vektron S10 Folding Electric Bike

Color: Gloss Silver
Size: One Size
Heads up! Bikes usually take 1-2 additional days to assemble but can take longer during busy periods. We'll email you when yours is ready.

Members get an estimated $369.90 (10%) back on this item as a part of your annual .

Members get an estimated $369.90 (10%) back on this item.
To buy,  sign in as an REI Co-op Member or join now.

Upgraded to the Bosch Performance electric drivetrain for 300% more assistance and 65 Nm of torque, the Tern Vektron S10 folding e-bike is built to handle long, hilly commutes in rain, snow or shine.


  • Bosch Performance motor with Purion display delivers pedal assist up to 20 mph, helping you carry groceries and tackle steep hills without the sweat
  • Purion onboard computer lets you switch between 5 different riding modes and displays handy info like speed, battery level and distance
  • Shimano Deore Shadow+ rear derailleur is streamlined and resilient to avoid damage while transporting the folded bike; clutch adjusts chain tension to avoid drops while riding
  • Go farther with the Bosch PowerPack 400 battery—it offers a range of up to 68 mi., depending on conditions and assist settings; battery weighs just 5.5 lbs.
  • Magura MT4 hydraulic disc brakes give you excellent stopping power in rain, snow or mud with the gentle pull of just 2 fingers
  • Andros™ patented adjustable stem lets you set your handlebar where you want in just seconds without tools; you can set your riding position to upright or long and low
  • Heavy-duty OCL+™ frame joint is built to exceed ISO 4210 and EN 15194 testing requirements; it stays stiff and strong during even the fastest commutes
  • Integrated Atlas V rack works seamlessly with one Thule Yepp Maxi or Yepp Nexxt Maxi child seat (not included)—no adapters needed; max load capacity is 59 lbs.
  • Porter+ saddle has a dual-density construction with gel cushioning to keep you comfortable while riding
  • GripPad™ underneath the saddle lets you grip the saddle nose confidently when you're rolling your bike around or put it on your shoulder to carry the bike
  • 360° of active lighting and 360° of reflectivity help you be seen from all angles when it's dark out
  • Bike resizes in seconds to fit riders from 4 ft. 10 in. to 6 ft. 5 in. (150–195 cm) so a single bike can be shared by the family
  • Easily fits on buses, subways and taxis for multimodal commuting
  • 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 Cargo Bikes

Technical Specs

Best Use

Urban Cycling

E-Bike Classification

Class 1: pedal assist up to 20 mph


Bosch Performance

Motor Type


Motor Torque (Nm)

65 Newton meters

Battery Type

Lithium Ion

Battery Capacity (Wh)

400 watt hours

Battery Removable


Charge Time (hrs)

2.5-4 hours

Pedal Assist Range

34-68 miles


7005-AL, OCL+ Joint





Bike Suspension

No Suspension


Hydroformed 6061 aluminum


6061 aluminum crankarms

Bottom Bracket

Motor Integrated


Shimano Deore

Rear Derailleur

Shimano Deore Shadow+

Rear Cogs

Shimano 10-speed, 11-36T

Number of Gears

10 gear(s)

Brake Type

Hydraulic Disc Brake


Magura MT4 hydraulic disc

Brake Levers

Magura hydraulic disc


Kinetix Comp for disc

Front Hub

Novatec, sealed cartridge bearing, disc

Rear Hub

Novatec, sealed cartridge bearing, disc

Wheel Size

20 inches


Schwalbe Big Apple 20 x 2.15 in. (55-406), puncture protection, Reflex

Tire Width

2.15 inches

Handlebar Shape

Flat Bar


Tern Andros adapted 6061 aluminum


Tern Andros, adjustable

Seat Post

Tern Telescope, 34.9/30.9 mm, 2014 aluminum


Tern Porter+




Flux Pro, angular contact bearings, Physis integrated


10-speed DHT for e-bike with GST corrosion-resistant coating


48 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

Size Chart

One Size
Height Range4'10''-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.

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