Skip to main content

Sun Seeker Fat-Tad CX

Sun Seeker Fat-Tad CX
Gloss Black/Bright Red
Please select options


The Sun Seeker Fat Tad CX is the most fun you’ll have this low to the ground, off-road. This bad boy is equipped with front and rear suspension, chromoly frame, plus 4-inch wide off-road tires! The Fat Tad will handle sand and gravel like no other trike out there. Shifting is smooth with SRAM drivetrain components and 3x8 gearing while reliable, all-weather braking is provided by the Promax mechanical disc brake up front. Other features include an aluminum seat frame, air-mesh padded seat, and provisions to mount four water bottle cages.

- X-Seam range: 37 – 50.5 inches

X-seam measurement diagram

The perfect recumbent starts by measuring which bike best fits your body and needs. The following information is provided to help guide on measuring your X-Seam. For more detailed information and to learn how to make the necessary recumbent bicycle adjustments, please refer to your Sun Seeker Owner’s Manual or visit your authorized Sun Seeker bike dealer.

Supplies Needed:
You will need a tape measure and a board that is approximately 30" to 48” long (an
ironing board will work).


1. Place one end of the board on the floor, then put the entire board flush against any wall.

2. Pull the bottom of the board 14 to 16” out away from the wall. This should simulate a comfortable reclined
position similar to what you would have when driving a car.
3. Pull your butt tightly against the bottom of the board (by holding the board steady in its position with your
hands, while gently scooting your butt against the board).
4. Extend your legs straight out (no bending of the knees), and point your toes straight up towards the ceiling. (It will be necessary to remove your shoes for this step.)
5. Now take the measurement from the base of the reclined board to the bottom of your shoeless heel.

VIOLA! You now have your “X-Seam” measurement, which will determine if you will fit your desired SUN SEEKER model recumbent.

Hint #1 – You can place a book at the base of your heel before you have straightened out your legs, then once your legs are straight, you can get up and make take the measurement from the board’s base to the point that your heel left the book.

Hint #2 – You may want to repeat the measuring process from start to finish, to insure that your “X-Seam” measurement is correct, if only for peace of mind.


Frame Tig Welded Chromoly with Rear Coil Over Suspension
Fork High Tensile Steel with Integrated Suspension
Headset Sealed Mechanism Steel
Rims/Wheels 20x54mm 36h Fat Bike Alloy
Hubs Front: Alloy Tadpole
Rear: Alloy 190mm Fat Bike Q/R
Spokes 14g. Stainless Steel
Tires 20×4.0 Fat Bike Knobby
Crankset Triple Alloy 170mm
Chainrings 42/32/22T
Bottom Bracket Height: 20" – 21 1/2" (51-55cm)
Front Derailleur Sunrace
Rear Derailleur SRAM
Cassette/Rear Cogs 11-34, 8 Speed
Shifters SRAM
Handlebars Chromoly w/ Bottle Braze-ons
Brake Levers Promax Allow w/Lock
Brakes Front: Promax Mechanical Disc
Pedals Platform
Saddle Alloy Frame 1pc – Padded/Mesh w/ Bottle Braze-ons, w/ Rans Style seat slide
Accessories & Extras Ground Clearance: 10" (25cm), Weight limit: 300lbs.

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
Gloss Black/Bright Red 888571019139 670241 BIK29823828D