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Carbon Seat Tube - Post minimum insertion

DefUnctUKDefUnctUK Posts: 38
edited April 2016 in Workshop

Quick question, i have a 2011 Wilier Izoard XP with the original Alu Deda seatpost. I'm just curious, the minimum insertion mark on the seatpost i assume is just for the post. Is there a minimum insertion for the frame? The reason i ask is that thinking about it, the frame must get stressed differently during riding when there is more post or less post in the tube (with front-back and lateral movement). The seatpost is like a lever i would say, clamped at the top, but the bottom surely moves about the clamp which is it's axis, right?

Has anyone ever heard of a carbon seat tube cracking or anything due to too little seatpost in it?



  • 964cup964cup Posts: 1,359
    As long as the bottom of the post extends past the bottom of the junction between the top tube and the seat tube, you'll be fine.
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