Originally Posted by
repechage
in the 70's the UCI rules really goofed things up for smaller riders. Today's dimension limits allow for "toe clip overlap" They also measure "front center" differently than a bike shop does along a line between the BB spindle center and the front wheel axle. The UCI measures a line parallel to the ground. (how a number of custom framebuilders do, really depends on how the jig is set up.) Richard Sachs measures the UCI way last he explained it.
Not sure the evolution of the rules, the UCI is always refining them but does not have an archive I could easily find on the history.
Also, in the 70's the official language of the UCI was French, they did not supply translations.
didn’t know all this, interesting. I suppose the UCI rules applied to all frame builders. Having measured a Peugeot PS10 50/53cm ST/TT and an Atala 50/51cm, to obtain the same result is it correct to conclude that different trade offs were made between TT length and fork rake? And that Raleigh decided to go mostly on TT length even on top racing models?