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"why was someone making slightly thicker-walled tubesets than regular 531 in the 90s?"
Usually, the smaller diameter seat posts are for tube sets where the seat tube is double butted (e.g. most decent Japanese bikes), whereas most 531 frames were built with a single butted seat tube, only the BB end was butted so the walls were thin where the seat post went in, therefore needing a large diameter post.
gbj_tester
Cheers - just seen some nice, cheap 27.0 posts on the bay and wondered what it was all about. I mean, I know they exist but I just thought "why was someone making slightly thicker-walled tubesets than regular 531 in the 90s?"