assuming we already understand both the mechanical and emotional reasoning. i think i asked the question wrong...i have seen multi-speed shift-kits & hubs (successfully) used either for or more speed or more hauling. i'm merely interested, no need for debates or criticism. using 30mph as a benchmark, is your multi-speed MB designed for speed or hauling. only 2 choices no "mix"...just the main reason. i can't edit my poll, so "efficiency" means "hauling power"...thanks.