Seatposts
Fixed seatposts for road and gravel, and a dropper post for MTB and cyclo-cross. Keep the diameter of your current seatpost, then choose setback, material and travel according to your position.
Setback first: it places the saddle
The diameter is set by the frame: you take the same as the seatpost already fitted. The real choice is setback, the distance between the seatpost axis and the centre of the saddle clamp. With 20 mm, the WCS 1-Bolt keeps the position of a classic road seatpost. With zero offset, the WCS 1-Bolt Zero Offset is for when the saddle ends up too far back even though it is already pushed forward on its rails. The numbers speak for themselves: at a 72 cm saddle height on a 73° seat tube, going from 20 mm of setback to zero steepens the effective angle by more than 1.5°. The saddle also moves closer to the handlebar, and a slightly longer stem sometimes restores the reach.
Carbon, and the exposed length
The Superlogic 1-Bolt FlexLogic is laid up to flex under the saddle: 15% more vertical compliance than other carbon layups, according to Ritchey. A seatpost works like a cantilever beam: its flex rises with the cube of the exposed length, and 240 mm out of the frame instead of 200 gives about 1.7 times more deflection.
A dropper post: measure before choosing the travel
The KS LEV Ci lowers the saddle while you ride. Choose its travel on the exposed post length at your saddle height, from the top of the seat tube to the top of the post head: it must fall between the minimum and maximum exposed lengths in the specifications. Then check the straight insertion depth of the seat tube, because a long-travel post goes deep. In 30.9 and 31.6 mm, the 125 mm has the same length as the 100 mm: 25 mm more travel without asking the frame for more insertion depth.
Choose the remote with the handlebar
The LEV Ci comes without a remote. On a flat handlebar with a 1x drivetrain, the Southpaw takes the place of the front shifter. On a drop handlebar, the KG Drop 1.0 clamps onto the handlebar, under the bar tape, without touching the levers.
Frequently asked questions
Which seatpost diameter should I choose?
That of your current seatpost, set by the frame: it is engraved on the seatpost and listed in the frame's specifications. A calliper settles it between two close sizes such as 30.9 and 31.6 mm.
Seatpost with or without setback?
Keep the setback of your current seatpost if your saddle is well positioned. A zero-offset seatpost is for when the saddle stays too far back even when slid forward on its rails; a bike fit settles it.
Can I fit a dropper post on a gravel bike?
Yes, if the frame has internal routing for the housing and enough straight depth in the seat tube. The KS LEV Ci comes in 27.2, 30.9 and 31.6 mm and is operated from a drop handlebar with the KG Drop 1.0 remote.