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Old 09-11-19, 09:38 AM
  #30  
rustystrings61
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Join Date: May 2013
Location: Greenwood SC USA
Posts: 933

Bikes: 2002 Mercian Vincitore, 1982 Mercian Colorado, 1976 Puch Royal X, 1973 Raleigh Competition, 1971 Gitane Tour de France and others

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25.8 mm seat post in a metric gauge frame means about 1.0 mm tubing wall, 'cause there's gonna be about .1 mm of slack to allow movement, typically. So comparable to plain gauge 531, or the nameless plain gauge stuff in my lovely old Liberia. So someone went to the trouble to fit a nicer crankset and wheels to it, which leads me to suspect it will be yet another exhibit in the long chain of items proving "The French have a way with gaspipe."
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