A 61 degree down tube to head tube angle would be common for a frame made with a 72 degree head tube to top tube angle. The down tube lug is stamped to show what angle it is made.
Doug Fattic Niles, Michigan
"I believe 72 would indicate the angle, but 61 would be a very strange angle. I suspect 61 here would be the seat tube length."
Chris Collins <firstname.lastname@example.org> wrote:
> The bottom bracket shell does *NOT* have anything
> stamped on it. From the archive I assume this means
> they are imitation nervex, correct?
> The headtube lugs stamped: "72" and "61" are tube
> angles, correct?
> --Chris Collins
> --Oakland, CA
> ***** Frame ******
> Top headtube lug - stamped "72"
> Bottom headtube lug - stamped "61"
> Seattube lug - stamped "76904"
> Bottom bracket shell - ?
> Seat stay plate: Pletscher (w/rack and brake
> Kickstand plate: Pletscher (w/mudguard attachment)