Seat Post diameter

fwb2006
fwb2006 Posts: 212
edited December 2008 in MTB general
I'm just about to order my new frame (Yeti 575) and on their www its say the seat post diameter is 30.9. Does that mean I need a 30.9 seat post or a slighter narrower one to 'slip inside'?

Cheers

http://www.yeticycles.com/#/ourrides/575/BLACK/

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