I love 180mm cranks. 175mm are usable. 170mm don't work my legs right. I tried 190mm years ago but immediately had right hip pain that was bad. 180's cause no pain and feel good for my leg length. On top of that I run 25.4mm pedal extensions on all my bikes. Pedal extensions plus long cranks really start limiting your lean angles. My Nishiki Sebring from the 80's has the lowest bottom bracket so coasting corners is the norm. I've had no trouble with long cranks while paved and dirt roading. My recumbent will let me pedal in the sharpest of corners but I have to will myself to keep pedaling. I go further faster with 180mm cranks than all shorter lengths of cranks. After building my Nishiki Sebring a few years ago i experienced a couple of pedal strikes in moderate corners and that cured me of pedaling in the corners on that bike.