Join Date: Feb 2010
Location: In the wilds of NY
Bikes: Box Dog Pelican, Raleigh Sojourn, Specialized Secteur, 1991 Cannondale tandem
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Originally Posted by techman
I have a Giant Cypress DX with a stock 30.9mm diameter seat post.
There is a carbon fiber seatpost from Nashbar I'd like to get, but its only available in a 27.2mm diameter.
Is it possible to use a 27.2mm diameter seat post in a bike that has a stock post of 30.9mm?
As other posters said, yes you can, with shims.
But that begs the question--why? I used to have a Cypress DX, and between the suspension and wide tires, it already had a very cushy ride. On a bike that heavy, the weight savings of a carbon post would be unnoticable.
Knows the weight of my bike to the nearest 10 pounds.