Originally Posted by
topflightpro
I had a Cannondale Six-13 that said Maximum Insertion was 200 mm, IIRC, and my 400mm post was too long. Additionally, at 400 mm, the post would hit the bottle cage bolts before the saddle was at the height I needed - meaning my saddle was too high. So, I cut about three inches off the bottom.
On the Six13, it's a function of the seat tube going from aluminum to carbon as you go down:
From the Owner's manual supplement:
"Six13 frames are designed and manufactured for a maximum seat tube insertion of 200mm. Below this level, bond materials inside the carbon section of tube could offer a slight resistance to a seat post inserted more than 200 mm."
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