Brett, Data just taken from two sets of Cinelli steel track bars, and one set of steel road bars, just to compare:
c.1971 track with no logos, and 14 end stamp - Clamp diam: varying higher and lower, but around 25.4-25.6mm, Wall thickness: ~1.3 to 1.4 mm.
c.1974 track with Cinelli Milano knight logo on both sides, and unknown end stamp - Clamp diam: varying higher and lower, but around 25.4-25.6mm, Wall thickness: ~1.3 to 1.4 mm.
c.1964 road with Cinelli Milano knight logo on drive side, Giro d'Italia wreath logo on non-drive side, and 17D end stamp - Clamp diam: varying but around 25.4, Wall thickness: ~1.1 to 1.2 mm.
It should be noted, that measurements taken with digital calipers in different places on the clamp area (laterally and rotationally), yielded a different reading for each, sometimes looking like an obvious increase in one part of rotation compared to another, suggesting slight ovalization, perhaps from clamp position. Also, in at least two sets measured, the diameter seems to grow larger toward the non-drive side, and on one set, notably larger at about 25.9mm, indicating that it is a good idea to insert in stem from drive side only. Hope this helps.
Ciao, Mark Agree Southfield, Michigan, USA ~ ~ ~
Date: Fri, 7 Jan 2011 21:52:53 -0800 (PST) From: Brett Horton <brett.j.horton@gmail.com> Subject: [CR] Cinelli Steel Track Bar - What Is The Wall Thickness?
For the life of me I cannot find my pair of NOS steel Cinelli track bars from the mid 1970s anywhere in my garage. I need to confirm the actual wall thickness which I seem to recall is 0.8mm. Does this sound correct? I've searched the archives and scoured the net and while confirmation of the 22.2mm diameter is out there, I can't seem to confirm the wall thickness. Any help is appreciated. Brett HortonSan Francisco, CA USA