OK, having both OCD and ADHD, I am getting pretty confused. It does not help guys like me went off on tangents about the frame and motor mounts. I tried to summarize the rear motor mount situation on
this web page, based on what I learned on this site and the parts books.
OK, back on topic. I will re-read this thread 5 times, but I think we have learned:
1) Some KR triple clamps are modified K-model.
2) There is a super-mystery aluminum KR mount, that looks similar to Ceriani, but isn't.
3) The post-70 race bike triple clamp is Ceriani.
Also I think this is what is going on in the stock bikes:
45738-52; 1952 to 1953 K; steel, non-parallel stem
45738-54A; 1954 to 1958 KH, XL, XLH, XLCH; steel, parallel stem
45738-59; 1959 to E1962 XL, XLH, XLCH; looks steel in diagram
45738-62; L1962 maybe 1965 XLH, XLCH
45739-62B; L1962 to 1974 XLH, XLCH; perhaps assembly with rubber handlebar mounts, note it is a 4573
9,looks aluminum called out for 71 and later.
45738-73; 1975 to 197? XLH, XLCH, I think internal throttle went away in 1975
45738-73B; 197? to 1978 XLH, XLCH, running change to -73 part, form fit and function equal?
45736-78B; 1979 to 1984 XL, XLCH, XLS; polished
47697-83A; 1983 to 1984 XLS; black wrinkle (contradicts -78B)
Using my three pictures, here is a non-parallel-stem front end, 1952-1953 K:
- 1952_K-model-trinple-tree_sfw.jpg (83.77 KiB) Viewed 30039 times
Here is a close-up of that 1952-53 triple clamp:
- 1952_K-model-triple-clamp-sfw.jpg (90.61 KiB) Viewed 30039 times
And here is another non-parallel front end:
- 1952_K-model-triple-tree_sfw.jpg (80.77 KiB) Viewed 30039 times
To that hand front end, I will try to stick on the other steel and aluminum clamps I have, to see if any fit. I am pretty confident I have a steel parallel top clamp, we shall see in a few minutes.