Whats the real-world performance difference between a high-end, featherlight rear derailleur and a mid-range, heavier option, and is it truly worth the upgrade cost for anyone who isnt a professional cyclist competing at the highest level? Do the grams saved really translate to noticeable improvements in power output, climbing efficiency, or overall speed, or is it just a marketing gimmick to separate enthusiasts from their hard-earned cash? Is the pursuit of a lighter rear derailleur simply a frivolous indulgence, a status symbol for the cycling elite, or a legitimate performance enhancer that can make a tangible difference for dedicated riders?
