The eternal debate about crank length, and yet people still seem to gloss over its actual impact on Zone 2 efficiency. For those still pedaling along in the dark ages, Zone 2 is where the magic happens - the sweet spot of moderate intensity, where your body is efficient enough to churn out decent power without burning out. Now, lets cut to the chase: whats the actual science behind crank length affecting Zone 2 efficiency? I dont want to hear any hypotheticals or self-reported results from some forum warrior who claims a 2.5% increase in power output after switching to 172.5mm cranks.
What I want to know is, can anyone provide concrete, data-driven evidence that shorter or longer cranks actually have a greater impact on Zone 2 efficiency than other factors like, say, aerodynamics, bike fit, or even gear ratios? Because from where Im standing, it seems like crank length is the least of our worries when it comes to optimizing Zone 2 performance.
And while were at it, lets talk about the oft-touted optimal crank length for different riders. Is it really about matching crank length to leg length, or is that just a myth perpetuated by sales reps trying to move more stock? What about the role of hip angle, foot size, and other biomechanical factors in determining the most efficient crank length for a given rider? And dont even get me started on the supposed advantages of shorter or longer cranks for different types of riding - crit racing, time trialing, or endurance events.
So, lets hear it: whats the real deal on crank length and Zone 2 efficiency? Is it a game-changer, or just another excuse for bike geeks to obsess over irrelevant minutiae?