NO, I didn't contradict myself, I said in my opinion I do not feel going from 172mm to 175mm or 170mm to 172mm, even from 170 to 175mm is going to make a big difference in performance. It may help with a "Fit" issue, but it's not going to make a person faster. I also said that the guys I ride with have shorter cranks and I drop them on the hills and rollers. My point in that was, I drop them because I spin faster with my 175 mm cranks than they do with their so called "shorter cranks". Whereas I have read in replies here that going from a 175 mm crank to a 172 mm or 170 mm crank would allow you to spin faster. Well you will not spin any faster just by reducing your crank length 1/8" or 3/16”. You want to spin faster work on the engine….

If you think less than a 1/8" or 3/16" of crank length will make you a lance Armstrong or enhance your performance and add 2-3 mph on your average speed, you are mistaken.