Is the notion that short crank lengths are inherently beneficial for efficient Zone 2 training nothing more than a marketing gimmick, and if so, what actual benefits do shorter cranks provide for endurance cyclists, if any, and are there any credible studies that support the claims made by manufacturers about the supposed benefits of shorter crank lengths for this type of training?
Furthermore, what constitutes a short crank length, and is this a one-size-fits-all solution, or are there specific crank lengths that are better suited to different rider types, such as those with shorter or longer legs, or those who prioritize comfort over outright efficiency?
Additionally, how do the supposed benefits of shorter crank lengths for Zone 2 training compare to the benefits of other factors, such as proper bike fit, optimal gearing, and efficient pedaling technique, and are there any situations in which a shorter crank length would actually be a hindrance to efficient Zone 2 training?
Its also worth considering that many professional cyclists and endurance riders have been using standard crank lengths for years with great success, so whats driving the trend towards shorter cranks, and is this just a case of the cycling industry trying to sell us something we dont need?
Finally, what are the best short crank options currently available for efficient Zone 2 training, and what sets them apart from standard crank lengths in terms of design, materials, and performance?