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
How acurate are you calipers? 9/16 is 14.2875mm so they are pretty close. My guess would be 9/16-20 if they say L & R. My French Lyotards say D & G for droit and gauche (right and left). Your best bet for the spindle is to look at the brand and any markings. Euro brands except Campy are usually ISO, Campy (this could start a religious war) has its own proprietary standard until '94 and ISO thereafter and most Japanese are JIS (with some exceptions). I can't just look at them and tell.
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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