Questions about cranks, which are the pieces of metal the pedals are attached to and then, in turn, rotate the bottom bracket and chainring.

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What types of BB-axle to crankarms interfaces are there?

On the lowest end, we have the taper/square interface. I believe it is standard i.e. there are no variations in the sizes. image property of VP Components USA Then there is the octalink. Actually ...
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Are 130 BCD chainsets stiffer than 110 BCD?

I would expect the crank spider not to sacrifice much stiffness in expanding from 110 to 130, but the chainrings seem flimsy in comparison. Do I buy extra stiffness by using a standard chainset ...