Joined: Aug 2003
Posts: 3,520
Likes: 12
From: Colorado Springs, CO
Bikes: 1959 Bottecchia Milano-Sanremo (frame), 1966 Bottecchia Professional (frame), 1971 Bottecchia Professional (frame), 1973 Bottecchia Gran Turismo, 1974 Bottecchia Special, 1977 Bottecchia Special (frame), 1974 Peugeot UO-8
A standard stem would be 22.2mm in diameter. French would be 22.0mm. 26mm would be Italian size bar clamp diameter where 25.4 would be standard and 25.0mm is the French standard. As to which one your would take, I'm not sure. By the late 70's you could be into that period when the French were switching to standard size so you'll need a Peugeot expert to help out here. Or you just buy a $10 micrometer and measure.
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1959 Bottecchia Milano-Sanremo(frame), 1966 Bottecchia Professional (frame), 1971 Bottecchia Professional (frame),
1973 Bottecchia Gran Turismo, 1974 Bottecchia Special, 1977 Bottecchia Special (frame),
1974 Peugeot UO-8, 1988 Panasonic PT-3500, 2002 Bianchi Veloce, 2004 Bianchi Pista