"Williams the conquerors of transmission troubles" (long running strap line to advertisements, a pun on William the Conqueror) B 5 pin BCSA type rings D for tandem as prefix of double chainring as suffix e.g. with the sword trademark in the middle and/or stamped Williams (on cranks). Well into the 60’s Williams continued to offered cranks with the original square bolt fitting.Of course, all this assumes the bike has the original component.The most likely components to be original are the stem, handlebars, seatpost, and brakes.Track/pista frames are not included in this registry. A TIPO RONDINE decal may or may not appear on some older Olmo bikes, and refers to the Agrati AM lugs, with 'rondine' meaning 'swallow.' Some older Olmos have the ornate Agrati lugs which Emilio Bozzi sold as Brianza sportiva lugs; the accompanying Agrati rear dropouts are stamped with a scalloped back. Campagnolo crank arms have a date code starting in 1973, consisting of a diamond (1970's) or circle (1980's) with a number in the center denoting the last digit of the year of manufacture, and then in 1985-9 with square and number in the center: 11 = 1985, 21 = 1986, 31 = 1987, 41 = 1988, 51 = 1989 plus some other examples. after the year of an Olmo in this registry designates uncertainty about its year or range of years.
This Olmo serial number registry records dated bike parts or provenance, to attempt correlating a serial number to a year or year range. Serial numbers are stamped on the seat lug on older bikes, or on the bottom bracket underside on later bikes (sometimes matched by a serial number on the fork steerer tube).Google Books Swallow rondine lugs with seat lug side slot; chrome head lugs and fork crown; chrome stay and fork ends; Campagnolo Cambio Corsa dropouts and fork ends BRAZE-ONS: top tube brake cable ORIGINAL PARTS: 4 speed Campagnolo Cambio Corsa; Campagnolo hubs; Nisi 36 hole rims; Magistroni Senior five pin crankset with 48t chainring; Olmo headset; Brooks B17 saddle; Balilla brakes; Silver blue paint DECALS: decal remnant on top of seat tube; otherwise, none DATING: book author says bike is 1948, from an Olmo team mechanic Serial Number 889 1946-1951? bg.legendary.bikes/e Bay: Seller does not say it is an Olmo in the listing and description; says it has Olmo stickers (bike may not be an Olmo?); does not have swallow rondine lugs; chrome forks; Campagnolo Cambio Corsa dropouts and fork ends DECALS: head tube and seat tube decals are Olmo 'Lazy L' star logo.Q: What is the compatibility between 10speed and 11speed?A: When Campagnolo started down the path of developing 11 speed, they looked at virtually every part of the transmission and redesigned it to cope with the extra demands of 11 speed.