The lightest seatpost with setback in the world -- that's what you're looking at... The AX-Lightness 2200 post uses the highest quality 1K carbon, which is internally butted, and reinforced in the clamping zone, to create a post that's strong, adjustable, and between 75 and 115 grams, depending on length. In addition to the 1k carbon cloth, AX-Lightness uses the highest quality titanium and aluminum for the M6 bolts and the posts. If you want the best, this is it.

These seat posts can not be cut or shortened, which is why they come in three lengths. There is a clearly marked clamping zone on each post, indicating both minimum and maximum insertion points. To determine the correct length of AX-Lightness post for your frame, you'll need to measure the insertion distance of your current post. Measure the distance from the rails of your saddle to the top of your seat clamp (where it exits the frame) and then compare with the insertion range numbers below:

L1 = 220 mm (insertion range of 100-170mm)
L2 = 290 mm (insertion range of 160-230mm)
L3 = 350 mm (insertion range of 220-290mm)