If I ever find a 1950s road racing bike, I will ride it in EroicaCA with gears appropriate to its era of racing and with spare tubulars across my shoulders. My EroicaCA bikes have been from the 80s and sporting the 42x24. If I get my 73 Le Champion finished in time, it will also have the 42x24. The most fun I have at EroicaCA is trying to hang with the guys with smaller clusters than that. They look the part and let me think I'm there.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.