Tapered hub 1268303004

The core function of transmission gears is to vary the gear ratio, thereby adjusting the torque and rotational speed delivered to the drive wheels, enabling the engine to meet diverse driving demands—such as heavy loads, uphill climbs, and high-speed cruising—while operating within its most efficient range. By combining different gear pairs, the gear ratio can be fine-tuned: lower gears provide high torque at low speeds, supporting acceleration from a standstill and heavy‑load hill climbing, while higher gears deliver lower torque at higher speeds, facilitating sustained high‑speed cruising and improving fuel efficiency.