That picture might be a help in locating my serial number. I am willing to bet that the serial number, on my Marinoni, is hidden under the derailleur guide bracket which is screwed to the underside of the bottom bracket housing. Might as well rebuild the bike while I am at it. When purchased, my Marinoni had just been serviced at a local and trusted bike shop so I never did rebuild anything. It was in perfect mechanical condition "as found" but that does not excuse my not checking to be sure. Time to do so. Yesterday was the first time that I have had the back wheel off...