Electric Eco-Tad SX

  • $ 2,907.00

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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 its lower price point.

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

What's this?
$250 Flat-Rate Shipping. Contiguous USA Only.
  • Ships Fully Assembled
  • 1 yr 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
The most affordable tadpole trike, the electric Eco-Tad SX



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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 Image
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 Brakes
Dual Disc Brake

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

Segment color display
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 color LCD includes a battery meter, speed and trip distance readout, and a programmable top speed limit.
simple gearing
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!
Watt Geared Hub Motor
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 Trike 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.

measure xseam image

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.


Eco-Tad SX overall sizing measurements
  • A: Handlebar Rise

  • B: Standover Height

  • C: Seat Length to Pedal

  • D: Seat Height to Ground

  • Recommended Rider Height

Eco-Tad SX length and width measurements


$250 Flat-Rate Shipping
The Contiguous USA Only.

Sales Tax
Sales tax will be applied to AR, AZ, FL, GA, IN, IA, KS, KY, MI, MN, NE, NV, NJ, NC, ND, OH, OK, PA, RI, SD, TN, UT, VT, WA, WV, WI and WY.

SHIPS 100% FULLY ASSEMBLED from Our Warehouse in Bucks County, PA
The bike is enclosed in a heavy cardboard box, protected by a wood frame, and fastened to a custom-built shipping pallet. Shipping is by freight truck with liftgate service included.

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. 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 afterward.

Shipping Size
73" x 40" x 51" / 190 lbs

Please note this custom electric trike ships with the E-BikeKit owners 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 trike. The specifications sections should also provide most of the information you'll want to know. If you have any questions, suggestions, or additional information that you would like to see posted, please let us know.

If you have any questions, please contact us at 
Tel: +1 800.375.0224  or 
Email: support@electrictrike.com


  • Top Speed

    26 Mph (w/ Programmable Limit)
  • Range

    10-44 Miles (Depends on the Battery Choice)
  • Motor

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

    9.4 lbs
  • Battery

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

    300 lbs (Including Rider and Cargo)
  • Charge Time

    4.5-5 Hours (From 0-100%)
  • Charger

    48v 2A – 48v 4A
  • Colors

    Blue, Red, and Navy
  • Intended Use

    Neighborhood, Cruising, Paved Path, and Urban
  • Drive Mode

    Throttle-on-Demand and Pedal-Assist, 5-Level Speed Control, Programmable Speed, Current Limit, and Assist Level
  • Frame Material

    High Tensile Tig Welded Steel
  • Fork Details

    High Tensile Steel, Rigid
  • Suspension

  • Rims

    20" Alloy, 36-Hole Doubled-Wall w/ Eyelets
  • Spokes

    (F) 14 Gauge, Stainless Steel / (R) 12 Gauge, Single-Butted, Stainless Steel
  • Tires

    Kenda Kwest, 20” x 1.5” at 40-65 psi. (Ships at 65 psi)
  • Saddle

    Steel Frame 1pc, Sunlite Padded/Mesh Back w/ Bottle Braze-on
  • Brakes

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

    Includes E-brake Shutoff and Parking Lock, One Lever for Each Front Wheel
  • Handlebar

    Chromoly Steel w/ 22.5mm Diameter / Bottle Baze-ons
  • Grips

    EVA Rubber Grips
  • Shifter

    SunRace Grip Shift
  • Display

    E-BikeKit Color LCD
  • Front Derailleur

  • Rear Derailleur

    SunRace RD-M37
  • Cranks

    Single Alloy, 170mm Length w/ 38t Chainring
  • Chain Guard

  • Pedals

    Wellgo R199, Alloy Cage
  • Gearing

    Shimano 7-Speed (1x7) / 14-28t Freewheel
  • Lights

  • Fenders

    Optional: Front and Rear Set, Black High ImpactPlastic w/ Stainless Steel Stays
  • 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 Modifications)
  • Wheelbase

  • Overall Length

    70.5”-78.75” (Depends on Riders X-Seam Set-up)
  • Max Width

  • Ground Clearance

    10” (From the bottom of the Steering Linkage to the Ground)
  • Turning Radius

    6' approx.
  • Overall Weight

    68-78 lbs (Depends on the Battery Choice)


Model Weight Range Mount Style Cost
48v 9Ah 5.8 lbs 10-22 Miles Battery Bag with Velcro Straps Base Cost
48v 10Ah 9.7 lbs 12-26 Miles Sliding Plate with Lock + $286
48v 20Ah 14 lbs 20-44 Miles Battery Bag with Velcro Straps + $366
  • Nominal Voltage

  • Nominal Capacity

    9-20Ah (Depends on the Battery Choice)
  • Battery Energy

    490-1092Wh (Depends on the Battery Choice)
  • Dimensions

    Depends on the Battery Choice
  • Total Weight

    < = Depends on the Battery 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

    Aluminum or Vinyl w/ Canvas Bag (Depends on the Battery Choice)
  • Battery Weight

    5.8-14 lbs (Depends on the Battery Choice)
  • Assembled Pack Certificates

    UL; UN38.3; MSDS; RoHS; SGS
  • Limited Warranty

    1 Year
  • Manufacturer

    Electric Bike Technologies, Inc.


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

Conversion Points:

Financing Options NOW Available!
Customer Reviews