Procedure

Loosen the seatpost clamp

at the top of the seat tube.

Wipe the inside of the seat tube

clean, especially if water has entered. Inspect the post for any old grease or residue.

Apply a thin layer of carbon paste

(if either is carbon) or grease (if both alloy) to the post.

Slide the post in

to your desired height. **Do not exceed the minimum insertion mark** on the post — usually a stamped line or marker. Going below the line risks frame damage and post failure.

Tighten the seatpost clamp

to spec. Most clamps spec **5–6 Nm**. **Do not over-tighten** — this is the most common cause of crushed seat tubes on aluminum frames and split carbon frames.

Test:

sit on the saddle and apply force. The post should not slip downward. > If the post still slips at correct torque: clean both surfaces with isopropyl, reapply carbon paste (which adds friction), retry. Don't keep cranking the clamp — that breaks frames. ---

Procedure #

Loosen the seatpost clamp at the top of the seat tube.
Wipe the inside of the seat tube clean, especially if water has entered. Inspect the post for any old grease or residue.
Apply a thin layer of carbon paste (if either is carbon) or grease (if both alloy) to the post.
Slide the post in to your desired height. Do not exceed the minimum insertion mark on the post — usually a stamped line or marker. Going below the line risks frame damage and post failure.
Tighten the seatpost clamp to spec. Most clamps spec 5–6 Nm. Do not over-tighten — this is the most common cause of crushed seat tubes on aluminum frames and split carbon frames.
Test: sit on the saddle and apply force. The post should not slip downward.

If the post still slips at correct torque: clean both surfaces with isopropyl, reapply carbon paste (which adds friction), retry. Don’t keep cranking the clamp — that breaks frames.

Seatpost Installation

Tools