Electric Eco-Tad SX
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The electric Eco-Tad SX is the most affordable Sun tadpole trike. It has a straightforward design that delivers comfort and features that exceed its lower price point.
The Eco-Tad SX 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 a nice option for this electric recumbent trike.
Highlights
- Most Affordable Tadpole
- Under-Seat Steering
- Horizontal Handlebars
- Mesh Padded SAeat
- Simple 1x7 Gearing
- 4 Water Bottle Mounts

Videos
Features
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.

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.

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




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.
Sizing

-
A: Handlebar Rise
15" -
B: Standover Height
15 -
C: Seat Length to Pedal
30"-44" -
D: Seat Height to Ground
16" -
Recommended Rider Height
5'-6'4"

Shipping
$250 Flat-Rate Shipping
Contiguous USA Only.
Orders shipping to PA will be subject to sales tax. There is no sales tax presently to any other state.
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 afterwards.
Shipping Size: 73" x 40" x 51" / 190lbs
Please Note: This custom electric 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 trike. 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.
If you have any questions, please contact us at
Tel: +1 800.375.0224 or
Email: support@electrictrike.com
Specs
-
Top Speed
26 mph (With Programmable Limit) -
Range
10-44 Miles (Depends on Battery Choice) -
Motor
E-BikeKit Rear Geared 500w-1,000w, 84Nm, 320rpm (48v) -
Motor Weight
9.4 lbs -
Battery
48v 9Ah, 48v 10Ah or 48v 20Ah -
Max. Payload
300 lbs (With Rider and Cargo) -
Charge Time
4.5-5 Hours -
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 and Current Limit, and Assist Level -
Frame Material
High Tensile Tig Welded Steel -
Fork Details
High Tensile Steel, Rigid -
Suspension
None -
Rims
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 -
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
EBT Grips – EVA Rubber -
Shifter
SunRace Grip Shift -
Display
E-BikeKit 2017 LCD Display -
Front Derailleur
N/A -
Rear Derailleur
SunRace RD-M37 -
Cranks
Single Alloy, 170mm Length w/ 38t Chainring -
Chain Guard
N/A -
Pedals
Wellgo R199, Alloy Cage -
Gearing
Shimano 7-speed (1x7) / 14-28t Cassette -
Lights
None -
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
37.5” -
Overall Length
70.5”-78.75” (Depends on Riders X-Seam Set-up) -
Max. Width
25" -
Ground Clearance
10” (Steering Linkage) -
Turning Radius
6' (Approx.) -
Overall Weight
68-78 lbs (Depends on Battery Type)
Battery
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
48v -
Nominal Capacity
Depends on Battery Choice: 9-20Ah -
Battery Energy
Depends on Battery Choice: 490-1092Wh -
Dimensions
Depends on Battery Choice -
Total Weight
< = Depends on Battery Choice -
Cell Assembly
18650-3.6v-13S -
Life Cycles
> = 80% Dod = 500 Cycles -
Max. Continuous Discharge
22.5A -
BMS Protection Current
30A -
Discharge Cut-Off Voltage
37.5v
-
Max. Charge Voltage
54.6v -
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 Battery Choice: Aluminum or Vinyl w/ Canvas Bag -
Battery Weight
5.8-14 lbs -
Assembled Pack Certificates
UL; UN38.3; MSDS; RoHS; SGS -
Manufacturer
Electric Bike Technologies
DIY
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:
- Use the "Sun Seeker Eco-Tad" e-bike conversion kit from E-BikeKit