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Why would you want to believe scientific tests using instrumented measurements, many test runs, many test subjects and test data results presented in easy to understand graphics when you should be listening to the personal observations of me and my internet friends?

There is a 1.6% difference in power between 145mm and 195mm cranks. 170mm falls in between and has an even smaller difference between either of them. I don't see how measuring power differences between 170 and 180 is going to yield differences that are greater.

The take away from the study is that if there is optimal crank arm length for you and you don't know what that is, 170mm is going to be at most 0.5% from optimal if you are extremely short or tall, less if you are more normal size. I can live with that.

If you keep reading through that study you will encounter even more heresy with pedaling efficiency that will cause the denizens of Forum 41 apoplexy.

Fortunately we C&Ver's pride ourselves on being able to swing our legs over a wide variety of top tubes and enjoy the ride and savor the difference!