Originally Posted by
blickblocks
I bought my friend and I each a Forte Precision seatpost at Performance today because they were really cheap, and we both wanted new ones anyways. We both have Panasonic Sport 1000's, and I used a caliper to measure the post which came to 26.85mm, so I bought 26.8mm posts. I can't get the new post in! Sheldon Brown wrote that the DX-2000 uses a 26.6mm post but that uses a totally different tubeset. Anyone know what size I need?
measure the INSIDE OF THE FRAME TUBE with the caliper: make sure you rotate the caliper while holding tension, so you get an accurate measurement (use the inside measurement ears) then release tension, and read the dial/screen.
you can also use these for accurate inside measurements of tubes:
http://www1.mscdirect.com/CGI/NNSRIT...51690&PMT4NO=0
you stick the "T" head down the tube, and tighten the dial, then remove and measure with a caliper, for EXTREMELY accurate inside measurements.