IME, way too much is made of tiny changes in crank length. Makes no sense. Going to shorter cranks is a fad right now, the solution to everything. 5.5 X your inseam (pubic bone to floor in socks) = crank length in mm. Measure and see what that is. My number is 165, but I ride 175 cranks with no issues. My wife's number is 149, but she rides 165s with no issues. Pantani rode 180s. My wife and I may be anomalous however: we've been hiking and riding and gymming together for almost 50 years. Being fit makes a difference.