Can some one explain BCD?

FluffyChicken":353lfhff said:
cce":353lfhff said:
144 still common on the track where the big guys use some absolute monster chainrings
On the track, why are they not using a fully integrated chainset ?
Where the ring is the crank itself?

I don't follow track or road much (or mtb these days much unless someone asks about it or I need a new part.)

They are at the highest levels, but for mortals it's useful to be able to change ratios
 
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