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Trek Madone Seatpost width

Jun 16, 2009
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I have lost the seat post clamp for my old Trek Madone frame.

I think is it a frame from 2007 or 2006

Does anyone happen to know the seatpost width? Is it a 27,2mm?

The reason I ask is because the bike is at home, I am at work, and bike shop 100m from office....;-) would like to get the clamp today if possible