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Mantis, Paramount, Campy
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spinning your legs fast (ie 100+ rpm) rather than putting effort (grinding/mashing) into each pedal stroke.
If you like to pedal fast shorter cranks are easier to do that with.
If you like to pedal slow then longer cranks give more leverage.

I would assume most of your riding has been on 175s. Do you have any issues with them? If not I'd stick with it.

I like to spin and prefer 172.5 MTB cranks at 6' with a 33" pants inseam.
And I swap crank lengths (between 165 and 175) on my road bike depending on the ride route or race course.
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