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Registered
Join Date: Jan 2002
Location: Nor California & Pac NW
Posts: 24,769
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26.4 mm or 26.6 mm for your PX-10.
Being French it used metric 531 tubing, which was smaller diameter inside and out than the British/ISO 531 tubing used in Raleighs etc. It therefore takes a smaller seatpost. The ISO tubing 531 frames (usually) take a 27.2 mm.
The metric 531 tubing is a bit lighter than the ISO, at the same frame size.
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