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Going fast purposes? In truth, non-specific purposes.
I guess I'm looking for a general rule here, or for examples where metal bikes would be a justified choice. I like owning metal bikes but if I'm looking at buying something specifically to go fast on (road, track, mtb, whatever), and something to go faster on is my mental justification for buying it, it'd seem daft if I then bought something intrinsically not as good for racing on.
If I'm buying a bike for performance purposes, is there ever any justification for looking at anything besides carbon?