Trying to figure out a new seat post for a bicycle. 27.2mm seatpost is too small... 30.8mm is too large. Just barely.
So, that leaves... 30.4? 30? 28.6?
(also... 350mm and 450mm seat posts are way too long... need a shorter seatpost).
Maybe time to invest in a caliper with finer scale measurements... 馃お