Joined: Jan 2009
Posts: 44,193
Likes: 6,425
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
It's been like this for a long time, but luckily there are charts that show equivalences.
A popular engineers' joke is: The great thing about standards is that there are so many to choose from.