Originally Posted by
roadfix
I would take a straight side on pic of the bike using a med focal length lens and take measurements off of that (with a protractor) using the straight line running between the front and real axles as the base line.
I've done the picture method and it works fine. If you have a flat top tube (non sloping) you can measure right from the top tube.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1