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Electric Eco-Tad SX

  • $2,052.00

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The electric Eco-Tad SX is the most affordable Sun tadpole trike. It has a straightforward design and delivers comfort and features that exceed it's lower price point.

The Eco-Tad has under-seat steering, a mesh and padded seat for comfort, a powerful 1000w watts of power, 26mph top speeds and plenty of torque to help power your ride. Available with multiple battery options to meet your range requirements. Fenders are also a nice option for this electric recumbent trike.

$250 Flat-Rate Shipping. Contiguous USA Only.
  • Ships Fully Assembled
  • 1yr Tire-to-Tire Warranty
  • World-Class Support


  • Most affordable tadpole
  • Under-seat steering
  • Horizontal handlebars
  • Mesh padded seat
  • Simple 1x7 gearing
  • 4 water bottle mounts


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The Eco-Tad SX is the most affordable Sun Tadpole Trike and it's full of features. It has a fully adjustable mesh-back saddle with a padded bottom that keeps you cool and comfortable. There are spare bottle mounts on the handlebar and seat frame.

Comfortable Handlebars

The Electric Eco-Tad features comfortable direct-steering handlebars. This allows for a familiar, natural hand position with higher handlebars than some under-seat steering recumbents.

Dual Disc Brake

The Electric Eco-Tad features independently controlled dual front disc brakes – this gives safe, long-lasting brake performance.

Easy-To-Read Segment Display
The Electric Eco-Tad features an easy-to-read backlit display with large text on an articulating mount. This advanced segment LCD includes a battery meter, speed and trip distance readout, and programmable top speed limit.
Simple 1x7 Gearing
Even if it's been a while since you rode a bike, you'll appreciate the Eco-Tad's simple 1x7 gearing. This system means every gear you need is available at the click of the wrist. No need to worry about double shifting or gear combinations!
500-1000 Watt Geared Hub Motor
The 500-1000w E-BikeKit rear geared hub motor features impressive 84Nm torque and a USA handbuilt wheel with single-butted 12-13 gauge spokes for durability.
The easy to use thumb throttle allows you to engage the motor whenever you need it. Use the throttle to get a boost when starting from a stop or to help get up to cruising speed. The Eco-Tad also features a pedal-assist sensor (PAS) for operation.

How to Measure Your X-Seam

At Electric Bike Store, we like to use the X-Seam Measurement to fit riders on recumbent trikes, and inseam to fit riders on upright trikes (like the Sun Traditional).

We use this measurement to adjust your trike to fit you out-of-the-box, but it's simple to adjust your trike later to suit your preferences. This is just a rough measurement to make things easier for you.

Alternatively, if you like reading and diagrams...

To measure your X-seam, you'll need a tape measure, a sturdy board (like a piece of plywood or an ironing board), and an assistant to help you. If you currently ride a recumbent bike, you can use that to take the measurement instead of the board.


  • A: Handlebar Rise

  • B: Standover Height

  • C: Seat Height to Pedal

  • D: Seat Height to Ground

  • Recommended Rider Height



$250 Flat-Rate Shipping.
Contiguous USA Only.

Orders shipping to PA will be subject to sales tax.

Ships fully assembled from our warehouse in Bucks County, PA. The trike is enclosed in a heavy cardboard box fastened to a shipping pallet, delivered by motor freight truck with liftgate service. We use a variety of freight carriers based on your shipping destination. When the trike ships you will receive an email from us with tracking information. Tracking is less precise than UPS or FedEx. The freight company will contact you before the final delivery is made in order to arrange the drop-off with you.

Delivery Time:
    East Coast: 2-4 business days
    Midwest: 3-5 business days
    West Coast: 5-7 business days

With liftgate service, the truck can only lower the pallet to the ground, they cannot deliver it inside your house. You will need to open the box and dispose of the pallet afterwards.

Shipping Size: 80" x 40" x 44" / 190lbs

Please Note: This trike ships with the E-BikeKit user manual for details on the electric-drive system and also with the Sun official manual for the trike itself. The video section above contains assembly instructions and tips for getting started and using your new electric bike. The specifications sections should also provide most of the information you'll want to know. If you have any questions or suggestions of additional information you would like to see posted, please let us know. Official manuals are in development, and once completed, they will be offered to customers that request them.

If you have any questions, please contact us at 
Tel: +1 800.215.1976  or  


  • Top Speed

    26mph (With programmable limit)
  • Range

    10-44 miles (Depends on battery)
  • Motor

    E-BikeKit Rear Geared 500w-1,000w, 84Nm, 320rpm (48v)
  • Motor Weight

  • Battery

    48v 9Ah, 48v 10Ah or 48v 20Ah
  • Max. Payload

    300lbs (With rider and cargo)
  • Charge Time

  • Charger

    48v 2A – 48v 4A
  • Color

    Gloss Blue
  • Intended Use

    Neighborhood, Cruising and Urban
  • Drive Mode

    Throttle-on-demand and pedal-assist. 5-level speed control, programmable speed limit, current limit, and assist level.
  • Frame Material

    High Tensile Tig Welded Steel
  • Fork Details

    High Tensile Steel, Rigid
  • Suspension

  • Rims

    Alloy, 36 hole doubled wall w/ eyelets
  • Spokes

    (F) 14g stainless steel / (R) 12-13g single-butted stainless steel
  • Tires

    Kenda Kwest, 20” x 1.5” at 65psi
  • Saddle

    Sunlite padded seat with mesh back / adjustable backrest angle
  • Brakes

    (F) ProMax Mechanical Disc Brakes w/ 160mm rotors
  • Brake Lever

    Includes e-brake shutoff and parking lock, one lever for each front wheel
  • Grips

    EBT Grips – EVA Rubber
  • Shifter

    SunRace Grip Shift
  • Display

    E-BikeKit 2017 LCD display
  • Front Derailleur

  • Rear Derailleur

    SunRace RD-M37
  • Chain Guard

  • Gearing

    Shimano 7-speed (1x7) / 38t Chainring / 14-28t Cassette
  • Pedals

    Wellgo R199 Alloy Cage
  • Lights

  • Fenders

  • Basket

    Optional - Steel, Black Vinyl Coated: 16.5" Long x 13.5" Wide x 9" High
  • X-Seam Range

    29”-49” (Smaller sizes may require modification)
  • Wheelbase

  • Overall Length

    70.5”-78.75” (Depends on rider x-seam set-up)
  • Max. Width

  • Ground Clearance

    10” (Steering Linkage)
  • Overall Weight

    68lbs-78lbs (Depends on battery type)


Model Weight Range Mount Style Cost
48v 9Ah 5.8lbs 10-22 Battery bag with velcro straps Base Cost
48v 10Ah 9.7lbs 12-26 Sliding plate with lock +$286
48v 20Ah 14lbs 20-44 Battery bag with velcro straps +$366
  • Nominal Voltage

  • Nominal Capacity

    (Depends on choice: 9-20Ah)
  • Battery Energy

    (Depends on choice: 490-1092Wh)
  • Dimensions

    (Depends on choice)
  • Total Weight

    < = (Depends on choice)
  • Cell Assembly

  • Life Cycles

    > = 80% Dod = 500 Cycles
  • Max. Continuous Discharge

  • BMS Protection Current

  • Discharge Cut-Off Voltage

  • Max. Charge Voltage

  • Inner Resistance

    < 50mΩ
  • Charge Time

    < = 3.3 hours
  • Operation Temperature Range

    Charge: 0°C – 45°C / Discharge: -20°C – 60°C
  • Storage Temperature

    0°C – 40°C (Extended Storage: 15°C – 25°C)
  • Battery Box Material

    (Depends on choice – aluminum or vinyl w/ canvas bag)
  • Battery Weight

  • Assembled Pack Certificates

    UL; UN38.3; MSDS; RoHS; SGS
  • Manufacturer

    Electric Bike Technologies


If you already have a Sun Seeker Eco-Tad and want to convert it to electric, we offer conversion kits at, including kits specifically for the Eco-Tad:

Conversion Points:

Financing Options NOW Available!
Customer Reviews