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Bottom bracket shell mark ID

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Bottom bracket shell mark ID

Old 03-28-23, 03:31 PM
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Bikes: 1989 Giordana Scorpius, 1992 Trek 930 Singletrack, 1986 Raleigh Super Course, 1988 Tommaso Cromor, 1984 Sekai 2500 Grandtour, 1980 Trek 412

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Bottom bracket shell mark ID

The C&V forum suggested I reach out to framebuilders for my question about bottom bracket shell sources. I have a late 80s - early 90s Giordana frame. Most Giordana frames are attributed to Billato. The frame size and tubing is stamped into the bottom bracket shell - “58 SL”. The letters “SR” are cast onto the shell surface. I’m curious about the source of this shell. Sakae Ringyo seems unlikely.
Any ideas?

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