Growing up in the '50's and '60's, most drummers, even the pros, seldom had more than 4 cymbals, not counting the hats and a splash.
Going by what I saw back in the day, most, certainly not all, had a ride over the BD and 1 crash over, or close to over the ride, and a 2nd crash on the left side not quite over the hats. It's not the rule, but it was what I saw most drummers playing.
As for cymbal size. I had the good fortune back in the mid '70's of getting to know Buddy a little bit at his clubs. When he had time, we would talk about cars, being in the service, and martial arts, rarely about drums.
If drums did come up, and if the conversation went to cymbals, he said that 18" was the optimum size for a crash. Belson said the same thing, and so did Mel Lewis, even though he played a smaller set and would, on occasion use a 16" or 17" crash.
Now, in this age of having 25 cymbals, who knows what the hell sizes they use. The same goes for the amount of drums I've seen in some sets and I'm not even counting Bozzio.
So, yes, you can put rides and crashes anywhere you want with whatever sizes you want because there are no rules, but there is practicality.
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