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Electric EZ-3 USX HD

  • $3,332.00

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The electric EZ-3 USX HD provides the stability and comfort of a recumbent trike while offering more thrills. The HD stands for heavy-duty, with 110 psi tires, 48-spoke wheels, and a 400 lb load capacity. The direct-drive motor is also HD and designed for heavier applications with 1000 watts of power.

Ideal for larger riders, the EZ-3 USX HD has a powerful braking system, mid-frame suspension, cambered rear wheels, and under-the-seat steering. Available with multiple battery options, optional rear fenders, and basket.

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$250 Flat-Rate Shipping. Contiguous USA Only.
Order now and you can expect shipping on or before Wednesday, Nov. 10
  • Ships Fully Assembled
  • 1yr Tire-to-Tire Warranty
  • World-Class Support


  • Low Center of Gravity
  • Stable Cambered Rear Wheels
  • Heavy-Duty 48-Spoke Rear Wheels
  • Double-Wall Rims
  • High-Pressure Tires
  • Rated for Riders up to 400 lbs
  • Extra Padded Mesh Seat
  • Mid-Frame Suspension
  • 20" x 1.9" Tires
  • Quick-Release Adjustable Seat
  • Quick-Release Backrest
  • Dual Rear Disc and Front V-brake
EZ-3 USX HD-Electric Trike


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The EZ-3 USX HD provides all the stability and control available in recumbent trike technology while offering a little more thrill. The HD stands for heavy-duty, with 110 psi tires, 48-spoke wheels with double-wall rims. The direct-drive motor is also heavy-duty and designed for heavier loads with 1,000 watts of peak power.

Advanced Mid-Frame Suspension

The mid-frame coil-over suspension on the EZ-3 HD helps smooth the roughest roads and keeps you riding when other trikes would give up.

Heavy-Duty Construction

With 48-spoke double-wall alloy rims, high-pressure tires, dual rear disc brakes, and front v-brake, the EZ-3 HD is built for a 400 lb capacity with a low center of gravity.

Easy-To-Read Segment Display
The EZ-3 HD features an easy-to-read backlit display with large text mounted on the handlebars. This advanced segment LCD includes a battery meter, speed and trip distance readout, and programmable top speed limit.
Cambered for Stability
The EZ-3 HD's Frame Geometry Features cambered rear wheels – this adds extra stability for easy and safe cornering by tilting each rear wheel inward towards the center of the frame by 2 degrees.
Heavy-Duty Direct-Drive Motor
The 500-1000w E-BikeKit motor is capable of pulling over 300 lbs and is laced into a USA handbuilt wheel with single-butted 12-13 gauge spokes for durability. This motor is seriously heavy-duty.
Thumb Throttle
The EZ-3 HD features an easy-to-use thumb throttle, so you can get power when you need it. The integrated pedal-assist sensor can also give you a boost to augment your pedaling.

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 Reach

  • B: Standover Height

  • C: Seat Length 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. 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 


  • Top Speed

    18 mph (With Programmable Limit)
  • Range

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

    E-BikeKit Front Heavy-Duty Direct-Drive 500w-720w, 31Nm, 259rpm (48v)
  • Motor Weight

    9.4 lbs
  • Battery

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

    400 lbs (With Rider and Cargo)
  • Charge Time

    4.5-5 Hours
  • Charger

    48v 2A – 48v 4A
  • Color

    Ultra Silver
  • 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

    Custom Steel, TIG Welded
  • Fork Details

    High-Tensile Steel, KSPEED 261 Mid-Frame Bumper Suspension
  • Rims

    (F & R) Alloy 48-hole Double-Wall
  • Spokes

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

    Maxxis Hookworm, 20” x 1.95” at 85-110 psi
  • Seatpost

    Rans Style Seat Slide
  • Saddle

    Sunlite Heavy-Duty Padded Seat w/ Mesh Back and Adjustable Backrest Angle
  • Brakes

    (F) ProMax V-brake / (R) WinZip Mechanical Disc Brakes w/ 160mm Rotor
  • Brake Lever

    Includes E-brake Shutoff and Parking Lock for Front-Wheel and One Dual-Pull Lever for both Rear Wheels
  • Stem

  • Handlebars

    Steel, Reverse Mounted Underneath Seat
  • Grips

    EBT Grips – EVA Rubber
  • Shifter

    SRAM Grip Shift 3.0
  • Display

    E-BikeKit 2017 LCD Display
  • Front Derailleur

  • Rear Derailleur

    Sram X3
  • Chain Guard

  • Gearing

    Shimano 21-speed (3x7) / 13-28t Cassette
  • Cranks

    Alloy 170mm w/ 30/42/52t Chainrings
  • Pedals

    Wellgo, LU-812, Alloy Cage Style w/ 9/16” Thread
  • Lights

  • Fenders

    Optional: Front & Rear Set, Black High Impact Plastic w/ a Glossy Finish
  • Basket

    Optional: Steel, Black Vinyl Coated: 16.25" Long x 13.25" Wide x 8.5" Deep
  • X-Seam Range

    29”-49” (Smaller Sizes May Require Modification)
  • Wheelbase

  • Overall Length

  • Max. Width

  • Ground Clearance

    3” (Rear Derailleur)
  • Turning Radius

    10'3-1/2" (Approx.)
  • Overall Weight

    61-71 lbs (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 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

  • 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 Battery Choice: Aluminum or Vinyl w/ Canvas Bag
  • Assembled Pack Certificates

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

    Electric Bike Technologies


If you already have a Sun Seeker EZ-3 HD and want to convert it to electric, we offer conversion kits at, including kits specifically for the EZ-3 HD:

Conversion Points:

Financing Options NOW Available!
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