This is a good way to tell what chain rings fit which cranks.
https://www.sheldonbrown.com/harris/chainrings.html
But be careful with recent cranks that do not have evenly spaced crank arms, the above does not cover the four arm ones that are not square. And note that there are four arm and five arm 74mm chainrings that are not interchangeable.
Originally Posted by
Miele Man
I have a Campagnolo Veloce 9-speed racing triple 30-42-52 on one of my bikes. I have an FSA crankset in my parts bin that also has 30-42-52 chainrings on it. To the best of my knowledge neither of those cranksets will take a chainring smaller than 30 teeth.
...
Most of the recent (last couple decades) square taper Campy cranks took a five arm 74 BCD granny gear. I have two bikes with those cranks with a non-Campy 24T aftermarket chainring.
The mid and large Campy rings are the ones that are a bit more rare with a 135mm BCD.