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ojwithbits
@jahknob
Hey, although I haven't checked this, I have always been under the impression that the distance is the length of the pump, so you would be measuring the gap between the back of the head tube and the front of the seat tube underneath the top tube.
And, BTW, if you need a frame pump (especially if it's a large that you are after), I still have a few available for sale (see above)