Originally Posted by
dbakl
I finally bought a tool that I had been dreaming of for years: a turned aluminum rod with all the sizes in steps over the length. Drop it in the frame, the one that fits is the size. I always found it hard to be accurate with calipers, so unless you have a bunch of seatposts around, its hard to judge sometimes.
Ditto. Pretty difficult to accurately measure the inside of a tube with vernier calipers. I go around and measure several places.