ELi5 | SM on Instagram: "A motorcycle uses a sequential transmission, meaning you shift through gears one by one using a shift lever connected to a ratchet and drum system. Inside, there’s a shifting drum with tiny grooves and detents, which are small notches. Each notch locks the drum into position for one gear like 1st, 2nd, 3rd, and so on. Neutral isn’t a full gear of its own. It’s just a sliver of space between 1st and 2nd gear. When the drum rotates, there’s a very small detent that represe