Bob Friedman asked,
> "Some time in the late
> 70s to early 80s Campy changed the arrangement of their cranks and BBs , so
> that newer cranks do not line up well on older BBs and vice versa. Does
> anyone know the rules on that? "
The following is retyped from page 30 & 32 of the 1982 Campy USA Olympic Catalog concerning mandated Consumer Product Safety Commission changes in 1978 and how this affects Campy equipment... All front derailleurs, rear derailleur cages, crankarms and axles were affected by these rules changes in the USA. I do not know if or when CPSC mandated changes also affected Campy European production. Please note these Campy quotes do not make any mention of later models of Triple cranks or axle dimensions (?126mm? or ?130mm?)
Regards, Steve Neago Cincinnati, OH
Taken from page 30...
"Between 1978 and 1979 Campagnolo changed the design of the right crank arm. This change makes more space between the outer chainring and the inside of the crank arm. In order to maintain the correct chainline, a new axle was designed, the identification of which is explained in the selection on Bottom Brackets. All new Nuovo and Super Record Cranksets are of the new style, however many old style units are still being used. To identify the new style, look at the collar around the axle hole on the back of the arm. The new style has a raised collar 5-6mm wide and 2mm high. The old collar is 10-11mm wide and 3mm high. Once you have seen both, the difference is obvious. The old arm will work on the new axle, but the new arm will not usually work on the old styles."
"The reason for this change is because of the Consumer Product Safety Commission's rules on bicycles. The definition of "PROTRUSION" is such that it included the outer tange plateof the front derailleur. To meet regulations, Campagnolo thickened the tange and the crank had to me modified to accomodate the change."
Taken from page 32...
"In order to comply with CPSC regulations, Campagnolo changed the design of the cranks arms in 1978. The modification of the arms necessitated a new axle to be provided. The new axles are identified by looking at the markings between the bearing races."