3 piece cranks vs. 1 piece cranks?

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Let's (not) forget the two-piece crank!

No more than one cotter pin, chainwheel securely welded to the crank, and of course the joy of press fit bearings. I know the chainwheels could wear out, but all that I possess have outlived or will outlive the bikes to which they were or are attached. Finally, friction welded on drive-side bearing cones...

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