531 seat tube size

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  • Not sure if this is the right place to post.
    Did Reynolds 531 ever come with a 27.0 seat post tube sizing? I’ve got a frame badged 531 but I’d always assumed 531 was always 27.2?

  • If the frame is english made then 27.2, correct me if I'm wrong...

  • Overtightened? Is the slot at the back straight?

  • Also depends on the age of the frame? Have a 1960 531 double-butted which is 26.4 yet all the other four (531, 531c x2 and 531 DB) are all 27.2 - but what @PhilDAS says...

  • Rumour has it that 531 for the French has a narrower seat post. Also rumour has it that large frames had thicker tubes with narrower seat posts........

  • My Dutch made 531 frame takes a 27.0, could be due to it having been over tightened though.

  • I’ve got a late 50s claud butler 531 frame that’s 27.0

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531 seat tube size

Posted by Avatar for sacredhart @sacredhart