Bicycle transmission refers to the system that transfers power from the rider's legs to the bike's wheels. This system typically includes components like the chain, gears, and derailleurs. The rider pedals, and the transmission adjusts the gear ratio, allowing for easier pedaling on hills or faster speeds on flat terrain. The main types of bicycle transmissions are single-speed and multi-speed systems. Single-speed bikes have one gear, making them simple and low-maintenance, while multi-speed bikes offer various gears to accommodate different riding conditions. This versatility helps cyclists optimize their performance and comfort during rides.