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
John wrote:
"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 <chris@eorbit.net> wrote:
> Hello,
>
> 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
> attachment)
> Kickstand plate: Pletscher (w/mudguard attachment)