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Where are the rollers in a moped?

The rollers in a moped are located inside the variator. The variator is a device that changes the transmission ratio between the engine and the rear wheel. It consists of two pulleys that are connected by a belt. The front pulley is driven by the engine, and the rear pulley is connected to the rear wheel. The rollers are located between the two pulleys. As the engine speed increases, the rollers move outward and cause the belt to move to a larger diameter on the rear pulley. This increases the transmission ratio and allows the moped to accelerate.