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I mean, carbon fibre obviously. Those Tron-like TT/tri bikes with 80mm wheels and no triangle in the frame aren't possible with other materials (unless you want a 30kg bike).
Even talking about just "functional" bikes there are frame shapes that are possible now that obviously would have been absurd with old metalworking practices
frankenbike
@JWestland
Disc brakes is maybe the only "new" thing, but those came down from motorbikes I believe?
Which got "invented"" when people put engines on pushbikes for teh lulz.