This article aims to explain the key differences between common servo / belt drive force feedback wheels, servo / gear drive force feedback wheels and newer direct drive force feedback wheels.
It's important to note that the term servo is widely misused in the racing simulation industry, causing the term to essentially mean nothing. It's unfortunate that these clever marketing gimmicks have won out in the minds of the consumer. Nonetheless, for the purpose of this article I will use the term as used in this market to prevent further confusion.
Servo and Belt drive systems utilize a hard-wired V-Belt and pulley system to help a smaller motor generate more torque. The steering wheel is NOT directly coupled to the motor shaft. Some products fall into the category of Servo and Belt.