My road bike has 170mm which have allowed me that feels just right cadence. My SUB (mtb) came with 175 and I never felt I could spin the same. Finally, I swapped it all out for 170 and I am happy, happy.
Linear measurement, yeah, it's 5mm on the radius, 10 on the diameter - but that is a lot on the circumference where your foot is moving. 175 is outside of my happy leg zone.



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