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After going to 165mm 75's from my previous 170mm setup, it made such a huge difference. Higher cadence was much smoother, none of that slightly rocking sideways in the saddle, not getting that "I'm spinning uncomfortably fast on this downhill/feeling" nervousness. Never thought 5mm would make such a difference.
surely with all your knee issues you wanna get cranks that aren't too long for you? no offense but seems a bit like form presiding over function here.