Joined: Jan 2010
Posts: 9,779
Likes: 1,747
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
I was curious about the tested PY10's frame angles, which I would presume to be at least a year ahead of the lesser production PX10LE.
Aligning parallel edges of an envelope in front of my PC screen, I can see that the HT angle has been relaxed a couple of degrees from the 75x75 angles of the production PX10 from 1973 to 1975, appearing to be more like 73 HT and 75 ST, likely what the team riders were using by this time.
By later '70's, a mid-sized PX10's frame angles had moderated to a more contemporary/intermediate 73 or 73.5 degrees.
Also mentioned was that the lever screws disappointingly had no wingnut adjustment, but wouldn't these have been Retrofriction levers by this time(?). (Retrofriction levers need no adjustment screws!)