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How to Measure Your X-Seam for Sunseeker Recumbents


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. You can also download this guide here. 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.

EZ-Sport CX & AX 36-45″
EZ-Classic SX 33-48″
EZ-Tri Classic SX 32-48″
Eco-Delta SX 31-53″
X3 AX 31-45″
Eurus 35-44″
EZ-3 USX HD 36-47″
Eco-TAD SX 31-53″
EZ-TAD SX 33-47″
T3 CX 29-39″
Fat-TAD CXs 37-50 1/2″
X-1 SX 32-47″
X-2 CX & AX 33-47″
X-3 SX 31-45″
EZ Tomahawk 36-43″
EZ-Sunray SX 35-42″
X-3 USX 35-48″
M3 UAX 29-47″
Tour Easy Sm/Md 36-42″
Tour Easy Med Lg/Xlg 41-48″
E1 SX 34-47″
E3 SX 33-45″