Sun EZ-3 Tri Classic SX Review

Sun EZ 3 Tri Classic

Sun Bicycle has been building adult tricycles for over forty years and has
become the largest seller of adult tricycles in the world.  I personally know Jack and Ben, at Sun Bicycle, and there are no harder working guys in the bike business.  Sun Bicycle’s philosophy has always been good quality at a low price and they stand behind the product.   

The Sun EZ-Tri Classic SX trike is a nice entry level delta style trike.
This trike has some of the same great features as the other Sun
recumbents, just at a lower price point. One of the most loved features
is the adjustable super soft gel seat and mesh back support.  The seat
is wide and just shaped right for your bottom, no matter if you are
skinny or much more padding of your own.  The
seat back support is contoured for your lower back and can be adjusted
for your personal taste with the nylon mesh straps on the back of the
seat.  The seat frame can
accommodate two water bottles and is designed to accommodate people up
to 300 lbs.  The seat can be easily adjusted by the two quick releases
under the seat without using any tools.  The seat angle can be adjusted without any tools as well, using the two spring clips on the seat stays.

Sun was able to keep the cost low by making the frame out of steel, compared to aluminum.  I will have to say that the Tig welding is very precise, performed cleanly and consistently.  The Chain Idler is well done and securely welded to the frame to stop the chain from bouncing too much.  The
Sun EZ-Tri Classic SX comes with 100 psi, low rolling, resistance Kenda
Kwest tires for an incredibly smooth, fast and effortless ride.  The
Shimano 21 speed drive train really gives you enough gears to conquer
just about any hill you can find.  Stopping
the Sum EZ Tri Classic trike is performed by a powerful rear-wheel disc
brake and a linear-pull front brake which worked flawlessly.  The brake
levers come with a parking brake button so you can park on a hill and
have no worries about your trike rolling away.  The handlebars have a comfortable bend and have attachments to carry two water bottles. 


Though the Sun EZ-Tri Classic SX is designed with comfort in mind, the
trike is perfect for intermediate and casual riders looking for some
light touring, commuting or just plain bike path fun.



  • A very comfortable seat bottom
  • Easier to get on and off of compared to a tadpole style trike
  • Low price


  • A little more tippy than a Tadpole style trike

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Trike Detailed Specifics

Spec Type Spec Value
Wheel Base
56.5″ (143cm)
Overall Length
73″ (185cm)
30.5″ (77.5cm)
Seat Height
22″ (56cm)
56 lbs
Weight Limit
300 lbs
Full Specifications As of 2013
Frame: High Tensile Steel, TIG-Welded
Fork: High Tensile Steel, TIG-Welded
Headset: Steel, Caged Bearings, Sealed, 25.4 x 34 x 30mm, Black
Handlebar: Steel w/2 Bottle Braze-ons
Stem: Alloy, 22.2 x 240mm Quill x 40mm Ext., Black
Grips: 2-Tone Kraton Gel
Front Brake Lever: Alloy, Linear Pull, Black/Silver
Rear Brake Lever: Alloy, Linear Pull, Black/Silver
Front Brake: Alloy, Linear Pull, Black
Rear brake: Single Mech. Disc
Front Shifter: Sram MRX 3-Speed Grip Shift
Rear Shifter: Sram MRX 7 Speed Grip Shift
Front Derailleur: Microshift, DP, 31.8mm Clamp
Rear Derailleur: Shimano Tourney, Black
Sprocket: Fixed Sprocket 15mm x 20T
Rear Axle: Rear Axle EZ3/X3 SX
Saddle: Contoured Foam w/Tri-Color Cover
Seat Mesh: Cool Mesh Seat Back
Seat Back: Cool Back Steel w/2 Bottle Mounting Points
Seat Cover: Tri-Stitch, Permanent
Seat Mount: Steel 1″ Black
Seat Mount Binder: QR M6x50mm Alloy
Seat Back Pivot Bolt: 10mm, Chrome
Upper Strut: Steel 150mm Black
Upper Strut Bolt: M5x35mm
Upper Strut Washer: Curved Nylon Washer
Lower Strut: Steel, Clamp Type, 240mm BLK
Strut Clamp: Pin with QR
Crank Set: Alloy 170×48/38/28 (steel rings)
Bottom Bracket: Sealed Cartridge, 68 x 118mm
Chain: 1/2″ x 3/32″, Sil/Gry, (218 Link Total)
Chain Guide: Single Guide Wheel
Chain Guide Hardware: Guide Wheel Hardware Double
Pedals: Resin Pedals, 9/16″
Front Hub: Alloy, 28H x 14G with Q/R Axle, Black
Rear Hub: Trike, Pinned Steel, 36H, Black
Front Rim: 16 x 1.5-1.75″ Alloy SL 36H
Rear Rim: 20 x 1.5-1.75″ Alloy SL 36H
Spokes: 14G Stainless Steel with Brass Nipples, Black
Front Tire: 16×1.50 BW Kenda Kwest 60psi
Rear Tire: 20×1.50 BW Kenda Kwest 60psi
Weight: 56 Lbs