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Old 01-14-22, 01:38 PM
  #14  
cyclophilia
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Join Date: Apr 2014
Location: Desert Southwest
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Favorite tool for measuring seat tube inner diameter

I like to use a telescoping gage, placed an inch and a half or more into the seat tube, to measure the inner diameter.

Then read the measurement with a vernier caliper or micrometer.

I'll take 2-3 different location readings in case the tube has been compressed or ovalized.

Remember too that a lot of vintage seat tubes can benefit from a good honing to clear accumulated oxidation and debris.
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