The data I found on Reynolds 531C has got me intrigued about the Vitus 172 tubing on my 1979 Peugeot. I've been told from the list that it is "similar" to 531, but does anyone have any actual data on its specs?
The data sheet I found in the (1988) article only listed Vitus 181, 888 and quite a few Super Vitus tubesets. Presumably the 172 was an earlier version.
Thanks,
Mark.