• Also, another way to tell if it is indeed Columbus PS is if it has thicker chainstays. They will bulge just after where they enter the BB shell, which it looks like they do from your photos. Columbus PS was basically SP but with stouter stays from my knowledge. Also the fact that it takes a 27.0 seatpost is another sign that this is what it was made of.

  • Good one thanks for the information. Nice to know these kinds of tubing properties.

    The chainstays do indeed bulge out behind the BB shell.

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