In other words, it's not specific enough. Nor is "gear" when it may or may not be including the crank length factor.
I can't think of a brief term that is not-too-techy but also not-too-technically-wrong that people with only a moderate amount of bike knowledge would understand.
I appreciate that the majority of YACFers have more knowledge than that, but I like to include the minority as well - to make as many posts as possible unstandable by as many people as possible, within reason, and within what doesn't seem too boring or patronising. It's not easy.