Phone: 800 561-6670

Price: $2,349.99


    The EZ-3 USX HD provides all the stability and control available in recumbent trike technology while offering a little more thrill. And when we say HD we mean heavy duty, with 110 psi tires, 48 spoke wheels with double-wall rims, this trike will handle 400 pounds. Setting this trike apart from others is its low center of gravity attained by three 20-inch wheels that are cambered in the rear to increase cornering stability. Also, the EZ-3 USX HD offers powerful brakes on all three wheels, mid-frame suspension and under-the-seat steering. The EZ-3 USX HD might not be for the superhuman daredevil, but it is quite perfect for the casual to intermediate rider, and perfect for sunny days on the bike path or zooming down the boardwalks. The EZ-3 USX features Direct Steering, the new Slotted Seat adjustment system, and rattle-free and infinite-adjust seat struts.

    • Wheel Base: 59.5" (151cm)
    • Overall Length: 78" (198cm)
    • Width: 32" (81cm)
    • Seat Height: 18" (45cm)
    • Weight: 65lbs
    • Weight Limit: 400lbs
    • X-Seam: 36-47"


    EZ3 USX HD Main Frame, Custom Steel, TIG-Welded
    Left Frame
    EZ3 USX HD LH Main Frame Section, Custom Steel, TIG-Welded
    Front Frame
    EZ3 USX HD Front Frame, Custom Steel, TIG-Welded
    Frame Bearing
    Frame Pivot Bearing, 32x12mm
    EZ3 USX HD Shock, KS-261, 150mm
    Frame Pivot Bolt
    Frame Pivot Bolt, 12mm
    1-1/8" High Tensile Steel for USX HD, D-Blade w/Steer Tab
    Front Shifter
    SRAM 3.0 3-Speed Grip Shift
    Rear Shifter
    SRAM 3.0 7-Speed Grip Shift
    Front Derailleur
    Microshift FD-M22, DP, 31.8
    Rear Derailleur
    SRAM X3
    Sunrace (7-Speed) 14-34T
    Freewheel Adapter
    Freewheel Adapter Threaded
    Crank Set
    Alloy, 3-Piece, 170x52/42/32T
    Bottom Bracket
    Sealed Cartridge, 68 x 118mm
    K.M.C. Z51 1/2 x 3/32'' (216 Links)
    Chain Tube
    Guide Tube
    Chain Tube Bracket
    Double Spring w/Hardware
    Chain Tube Clamp
    Clamp w/Hardware
    Resin Body w/Alloy Cage, 9/16"
    Front Brake
    Alloy, Linear Pull, Black
    Rear brake
    Promax DSK-400 Disc w/160mm Rotor
    Steel Integrated, 28.6x44x30mm, Black
    Rear Headset
    Steel, 28.6x34x30mm Threadless for Underseat Steering
    Alloy, Recumbent, Underseat
    Right Handlebar
    Right Handlebar Extension USX 22.2mm
    Left Handlebar
    Left Handlebar Extension USX 22.2mm
    Alloy, Threadless, 28.6 x70mm x25deg x25.4mm Clamp, Black
    Kraton Rubber-Gel, 75mm, 2-Tone Black/Grey
    Front Brake Lever
    Linear Pull w/Lock, Black/Silver
    Rear Brake Lever
    Linear Dual Pull, Black/Silver
    Recumbent, w/Tri-Stitch Cover
    Front Hub
    Alloy, 48H x 14G with Q/R Axle, Black
    Rear Hub
    Alloy, 48H x 14G with 14mm Bolt-On Axle, Black, For F/W, Disc Compatible
    Front Rim
    Alloy, Double Wall 20'' x 48H x 14G, Black
    Rear Rim
    Alloy, Double Wall 20'' x 48H x 14G, Black
    14G Stainless Steel with Brass Nipples, Black
    Front Tire
    Maxxis Hook Worm 20 x 1.95", 110psi
    Rear Tire
    Maxxis Hook Worm 20 x 1.95", 110psi
    Replacement Parts
    Rear Unit Hardware
    Rear Unit Hardware Kit
    Head/Derailleur Tube Cap
    Head/Derailleur Tube Cap
    Steering Linkage
    USX HD Silver
    Left Rod End
    Left Hand Thread
    Right Rod End
    Right Hand Thread
    Left Rear Axle
    Rear Axle Left Side USX
    Right Rear Axle
    Rear Axle Right Side USX
    Locking Axle Collar
    Locking Axle Collar & Spacer EZ3/X3 USX
    Internal Snap Ring
    Rear Axle Internal Snap Ring USX 2"
    Axle Bearing
    Rear Unit Axle Bearing 20id x42od x9w EZ3 USX HD
    Axle Retaining Bolt
    Rear Axle Retaining Bolt/Cap USX RH Sml
    Axle Retaining Nut
    Rear Axle Retaining Bolt/Cap USX LH Lrg
    Hub Retaining Bolt
    Trike Hub Ret Bolt/Cap for Square or Tapered, Black
    Seat Mesh
    Cool Back Seat Mesh
    Seat Back
    Cool Back Steel w/Dual Bottle Mounts
    Seat Cover
    Tri-Stitch, Permanent
    Seat Mount
    Steel for 31.8mm TT
    Seat Mount Binder
    QR M6x88mm Alloy, XL Lever
    Seat Back Pivot Bolt
    10mm, Chrome
    Upper Strut
    Steel 150mm Black
    Upper Strut Bolt
    Upper Strut Washer
    Curved Nylon Washer
    Lower Strut
    Steel, Pin Type, 700mm Universal
    Lower Strut Slide Bolt
    Lower Strut Bolt and Nut
    Strut Peg QR
    Steel Pin, QR
    Bottom Bracket Cover
    Shell Cover Black
    65 Lbs.

    Review from Adult Tricycle Review

    The Sun EZ-3 USX is a human-powered, recumbent, three wheeled vehicle. It engages me in a way that the Segway did not. I am amazed this product, what some call a “bent trike,” is not better known.

    What’s significant about the USX? It’s the most comfortable human powered vehicle ever, more comfortable than many cars. It’s safe, practical, and affordable. I hate exercise but I find myself impatient to get my next chance to ride this thing. The USX is potentially a major step forward in promoting conservation and healthy exercise in America.

    Riding the USX is eerie, because it feels like relaxing on a perfect easy chair and performing aerobic exercise at once. You can go fast or slow, and both are wonderful. You can load the thing with 400 total pounds. You can pull carts. Some riders have decked out USX’s with ipod sound systems and other amenities.

    There are some downsides. It’s heavy: 65 pounds. Going up hills is pleasant, but slower than on a bicycle.

    Another big plus: you sit high enough to be noticed by car drivers, though I also added a flag and extra lights to err on the side of caution. Although it looks wide, and encourages cars to give more room than is commanded by bicyclists, it is actually narrow enough to roll through a standard door. You can stand it up on end so it takes minimal room when parked. You can just stop and rest while going up hill- it has a parking brake.

    There are lots of other bent trikes — dozens — but most are “performance-oriented” — made for athletes. Some of the athletic brands are
    ICE, HP Velotechnik and , Catrike. I have tried some of them, and I think they are fun and interesting, but not what I want. Some of them are expensive, very low slung (you’re practically on the ground while riding), and not so practical for non-atheletes. What I want is something that’s super easy to get in and out of, that’s fun to sit on while standing still, that’s high up enough to be safe around cars, and that is fun to ride slow. I want something for life, not for sport, and there’s not much competition in this niche. There is another interesting comfort-oriented bent trike, the Hase Leupus, from Germany.

    Beware that sometimes enthusiast cults get lost in fantasy. The enthusiasm in the bent trike world sometimes reminds me of what happened with high-end consumer audio. Superstitions crowded out reality. People started to spend insane money on audio cables with impossible physical properties.

    Even though the USX is ridiculed by some hard-core bent bike enthusiasts, it is an important product, even aside from the low price.

    Overall Customer Rating of 3 Reviews:
    review-star review-star review-star review-star review-star

    I love my Sun Seeker trike

    review-star review-star review-star review-star review-star
    I had a very bad knee ,painful for walking, and I read about biking instead of walking.
    This is the perfect trike because it is a recumbent and does not hurt my knee at all. My legs are as strong as they were in high school and I am 76. I bike seven to eight miles a day and more on Saturdays. This is a great bike for seniors. I had this bike for four years and it is my prized possession!
    We have a bikers group and as they age, more guys and gals are getting this model.

    Indianapolis, IN

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    bought a three wheeler to try and get back into shape. The usx has a nice upright seat and is pretty comfortable to ride. I typically ride between 30 minutes and an hour and do not experince any discomforts. the steering takes a little bit to get used to. My biggest complaint is the grip shifters, I much prefer the trigger style shifter and I wish they were an option for this trike.

    New Roads La.

    The only trike that worked for me.

    review-star review-star review-star review-star review-star
    The Sun Seeker EZ-3 USX HD suited my needs for a heavy duty recumbent. I am close to 400 Lbs which limited me to just a couple of recumbent. The Terratrike Rove, Trident Titan and the Sun USX HD. I had a bit of trouble getting around the cranks on the Rover and Titan and was afraid of falling which led me to the Sun USX HD. The USX was just easier to get on and off which made my choice easy. The USX HD is a heavy duty trike, that is what the HD stands for. The USX HD has a 400 Lbs capacity and I am sure the frame and wheel could take a lot more weight than that. I would bet the shock, rear axle or seat bottom is probably the limiting factor. My trike has forty eight spokes in the wheel where as other trikes have only thirty six so I know my wheels are very strong and can handle my weight. The frame is made of steel and is very strong and should easily be able to handle 400 Lbs plus. My trike has twenty one speed which are enough for my needs.
    I like that the trike has two rear disc brakes one for each rear wheel and a front brake as well. The two rear brakes have a soft feel to them, I would prefer that they felt more like the front brake. I wish the handlebar were adjustable for width not just forward and backward. I also feel the handlebars a back a bit far for my taste but that might be ok if you are taller than I am. I would have like to seen an upgrade to the shock, like and air shock so it would be more adjustable. The trike seems to be a fair amount heavier than other trikes that are designed to carry 400 Lbs.