So far the only surprising data (to me anyway) is the proliferation of the 52mm. Great tech wheel, nice and light. I thought for some reason everything was trending upwards. At least in my area. Lots of 55 and 56 where I’m at. Funny how the 57 is the bastard size.
Thinking back 57 mm used to be pretty common in the older Spitfire wheels, with so many options just from the one brand, but now I can only think of the Bigheads and Radial Oski off the top of my head, both of which are rather limited in supply.
A few others when I went looking though - Skate like a girl Classics, Lock ins, then some OJs / Slimeballs, Rictas, but so few all up compared to almost every other size.
The funny thing is more than a few people I know have issue with odd number sized wheels, so they will ride 52, 54, 56, 58 or 60 only, never 51, 53, 55, 57, 59 etc. Just another one of those "interesting" facts that make no sense to some people, but make absolute sense to others.